diff --git a/Dockerfile b/Dockerfile
index b5258d91b..7fc1af1af 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ MAINTAINER jekkos
 RUN sed -i -e 's/archive.ubuntu.com\|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
 RUN apt-get update
 RUN apt-get -y upgrade
-RUN DEBIAN_FRONTEND=noninteractive apt-get -y install mysql-client mysql-server apache2 libapache2-mod-php5 pwgen python-setuptools vim-tiny php5-mysql php5-gd nodejs npm curl
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install mysql-client mysql-server apache2 libapache2-mod-php5 pwgen python-setuptools vim-tiny php5-mysql php5-gd php5-apcu nodejs npm curl
 RUN easy_install supervisor
 ADD ./docker/foreground.sh /etc/apache2/foreground.sh
 ADD ./docker/supervisord.conf /etc/supervisord.conf
diff --git a/README.md b/README.md
index 51a290a2e..5da8f3ea4 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,10 @@ username: admin
 password:pointofsale
 9. Enjoy
 
+FAQ
+---
+If an blank page (HTTP status 500) shows after search completion or receipt generation, then double check php5-gd presence in your php installation. On windows check in php.ini whether the lib is installed. On Ubuntu issue `sudo apt-get install php5-gd`. Also have a look at the Dockerfile for a complete list of recommended packages.
+
 13/01/2016: Install using Docker
 -------------------------------
 From now on ospos can be deployed using Docker on Linux, Mac or Windows. This setup dramatically reduces the number of possible issues as all setup is now done in a Dockerfile. Docker runs natively on mac and linux, but will require more overhead on windows. Please refer to the docker documentation for instructions on how to set it up on your platform.
diff --git a/application/helpers/table_helper.php b/application/helpers/table_helper.php
index 722a238d2..792c25cea 100644
--- a/application/helpers/table_helper.php
+++ b/application/helpers/table_helper.php
@@ -66,7 +66,7 @@ function get_sales_manage_sale_data_row($sale, $controller)
 	$controller_name = $CI->uri->segment(1);
 
 	$table_data_row='<tr>';
-	$table_data_row.='<td width="3%"><input type="checkbox" id="sale_' . $sale['sale_id'] . '" value="' . $sale['sale_id']. '" /></td>';
+	$table_data_row.='<td width="3%"><input class="print_hide" type="checkbox" id="sale_' . $sale['sale_id'] . '" value="' . $sale['sale_id']. '" /></td>';
 	$table_data_row.='<td width="15%">'.'POS ' . $sale['sale_id'] . '</td>';
 	$table_data_row.='<td width="17%">'.date( $CI->config->item('dateformat') . ' ' . $CI->config->item('timeformat'), strtotime($sale['sale_time']) ).'</td>';
 	$table_data_row.='<td width="23%">'.character_limiter( $sale['customer_name'], 25).'</td>';
@@ -75,12 +75,12 @@ function get_sales_manage_sale_data_row($sale, $controller)
 	$table_data_row.='<td width="8%">'.to_currency( $sale['change_due'] ).'</td>';
 	$table_data_row.='<td width="12%">'.$sale['payment_type'].'</td>';
 	$table_data_row.='<td width="8%">'.$sale['invoice_number'].'</td>';
-	$table_data_row.='<td width="8%">';
-	$table_data_row.=anchor($controller_name."/edit/" . $sale['sale_id'], $CI->lang->line('common_edit'),array('class'=>"modal-dlg modal-btn-delete modal-btn-submit",'title'=>$CI->lang->line($controller_name.'_update')));
+	$table_data_row.='<td width="8%" class="print_hide">';
+	$table_data_row.=anchor($controller_name."/edit/" . $sale['sale_id'], $CI->lang->line('common_edit'), array('class'=>'modal-dlg modal-btn-delete modal-btn print_hide', 'title'=>$CI->lang->line('common_edit')));
 	$table_data_row.='&nbsp;&nbsp;&nbsp;&nbsp;';
-	$table_data_row.='<a href="'.site_url($controller_name. "/receipt/" . $sale['sale_id']) . '">' . $CI->lang->line('sales_show_receipt') . '</a>';
+	$table_data_row.=anchor($controller_name."/receipt/" . $sale['sale_id'], $CI->lang->line('sales_show_receipt'), array('class'=>'print_hide', 'title'=>$CI->lang->line('sales_show_receipt')));
 	$table_data_row.='&nbsp;&nbsp;&nbsp;&nbsp;';
-	$table_data_row.='<a href="'.site_url($controller_name. "/invoice/" . $sale['sale_id']) . '">' . $CI->lang->line('sales_show_invoice') . '</a>';
+	$table_data_row.=anchor($controller_name."/invoice/" . $sale['sale_id'], $CI->lang->line('sales_show_invoice'), array('class'=>'print_hide', 'title'=>$CI->lang->line('sales_show_invoice')));
 	$table_data_row.='</td>';
 	$table_data_row.='</tr>';
 
diff --git a/application/libraries/Receiving_lib.php b/application/libraries/Receiving_lib.php
index d2044a3f9..75c8ef359 100644
--- a/application/libraries/Receiving_lib.php
+++ b/application/libraries/Receiving_lib.php
@@ -200,8 +200,8 @@ class Receiving_lib
             'item_location'=>$item_location,
             'stock_name'=>$this->CI->Stock_location->get_location_name($item_location),
             'line'=>$insertkey,
-            'name'=>base64_encode($item_info->name),
-            'description'=>base64_encode($description!=null ? $description: $item_info->description),
+            'name'=>$item_info->name,
+            'description'=>$description!=null ? $description: $item_info->description,
             'serialnumber'=>$serialnumber!=null ? $serialnumber: '',
             'allow_alt_description'=>$item_info->allow_alt_description,
             'is_serialized'=>$item_info->is_serialized,
@@ -236,7 +236,7 @@ class Receiving_lib
         if(isset($items[$line]))
         {
             $line = &$items[$line];
-            $line['description'] = base64_encode($description);
+            $line['description'] = $description;
             $line['serialnumber'] = $serialnumber;
             $line['quantity'] = $quantity;
             $line['discount'] = $discount;
diff --git a/application/libraries/Sale_lib.php b/application/libraries/Sale_lib.php
index a1ba8c524..fa21d14f2 100644
--- a/application/libraries/Sale_lib.php
+++ b/application/libraries/Sale_lib.php
@@ -305,9 +305,9 @@ class Sale_lib
                     'item_location'=>$item_location,
                     'stock_name'=>$this->CI->Stock_location->get_location_name($item_location),
                     'line'=>$insertkey,
-                    'name'=>base64_encode($item_info->name),
+                    'name'=>$item_info->name,
                     'item_number'=>$item_info->item_number,
-                    'description'=>base64_encode($description!=null ? $description: $item_info->description),
+                    'description'=>$description!=null ? $description: $item_info->description,
                     'serialnumber'=>$serialnumber!=null ? $serialnumber: '',
                     'allow_alt_description'=>$item_info->allow_alt_description,
                     'is_serialized'=>$item_info->is_serialized,
@@ -396,7 +396,7 @@ class Sale_lib
 		if(isset($items[$line]))	
 		{
 			$line = &$items[$line];
-			$line['description'] = base64_encode($description);
+			$line['description'] = $description;
 			$line['serialnumber'] = $serialnumber;
 			$line['quantity'] = $quantity;
 			$line['discount'] = $discount;
diff --git a/application/models/Receiving.php b/application/models/Receiving.php
index 905d4396c..2de3f5230 100644
--- a/application/models/Receiving.php
+++ b/application/models/Receiving.php
@@ -76,12 +76,11 @@ class Receiving extends CI_Model
 			$cur_item_info = $this->Item->get_info($item['item_id']);
 			
 
-			$receivings_items_data = array
-			(
+			$receivings_items_data = array(
 				'receiving_id'=>$receiving_id,
 				'item_id'=>$item['item_id'],
 				'line'=>$item['line'],
-				'description'=>base64_decode($item['description']),
+				'description'=>$item['description'],
 				'serialnumber'=>$item['serialnumber'],
 				'quantity_purchased'=>$item['quantity'],
 				'receiving_quantity'=>$item['receiving_quantity'],
diff --git a/application/models/Sale.php b/application/models/Sale.php
index cb437d55b..c5bd1788f 100644
--- a/application/models/Sale.php
+++ b/application/models/Sale.php
@@ -296,7 +296,7 @@ class Sale extends CI_Model
 				'sale_id'=>$sale_id,
 				'item_id'=>$item['item_id'],
 				'line'=>$item['line'],
-				'description'=>character_limiter(base64_decode($item['description']), 30),
+				'description'=>character_limiter($item['description'], 30),
 				'serialnumber'=>character_limiter($item['serialnumber'], 30),
 				'quantity_purchased'=>$item['quantity'],
 				'discount_percent'=>$item['discount'],
diff --git a/application/models/Sale_suspended.php b/application/models/Sale_suspended.php
index 993e81e71..df3324616 100644
--- a/application/models/Sale_suspended.php
+++ b/application/models/Sale_suspended.php
@@ -86,7 +86,7 @@ class Sale_suspended extends CI_Model
 				'sale_id'=>$sale_id,
 				'item_id'=>$item['item_id'],
 				'line'=>$item['line'],
-				'description'=>character_limiter(base64_decode($item['description']), 30),
+				'description'=>character_limiter($item['description'], 30),
 				'serialnumber'=>character_limiter($item['serialnumber'], 30),
 				'quantity_purchased'=>$item['quantity'],
 				'discount_percent'=>$item['discount'],
diff --git a/application/views/partial/header.php b/application/views/partial/header.php
index e119086b8..7d39fe4e0 100644
--- a/application/views/partial/header.php
+++ b/application/views/partial/header.php
@@ -64,11 +64,11 @@
 		<!-- start mincss template tags -->
 		<link rel="stylesheet" type="text/css" href="dist/bootstrap.min.css?rel=9ed20b1ee8"/>
 		<link rel="stylesheet" type="text/css" href="dist/jquery-ui.css"/>
-		<link rel="stylesheet" type="text/css" href="dist/opensourcepos.min.css?rel=3ded88f8ce"/>
+		<link rel="stylesheet" type="text/css" href="dist/opensourcepos.min.css?rel=60674239d1"/>
 		<link rel="stylesheet" type="text/css" href="dist/opensourcepos_bower.css"/>
 		<!-- end mincss template tags -->
 		<!-- start minjs template tags -->
-		<script type="text/javascript" src="dist/opensourcepos.min.js?rel=52d78ada05" language="javascript"></script>
+		<script type="text/javascript" src="dist/opensourcepos.min.js?rel=10400d243b" language="javascript"></script>
 		<!-- end minjs template tags -->
 	<?php endif; ?>
 
diff --git a/application/views/receivings/receipt.php b/application/views/receivings/receipt.php
index 4cdf7c08d..a7c6d3d11 100644
--- a/application/views/receivings/receipt.php
+++ b/application/views/receivings/receipt.php
@@ -63,7 +63,7 @@ if (isset($error_message))
 		{
 		?>
 			<tr>
-				<td><span class='long_name'><?php echo base64_decode($item['name']); ?></span><span class='short_name'><?php echo character_limiter(base64_decode($item['name']),10); ?></span></td>
+				<td><span class='long_name'><?php echo $item['name']; ?></span><span class='short_name'><?php echo character_limiter($item['name'],10); ?></span></td>
 				<td><?php echo to_currency($item['price']); ?></td>
 				<td><?php echo $item['quantity'] . " " . ($show_stock_locations ? " [" . $item['stock_name'] . "]" : ""); 
 				?>&nbsp;&nbsp;&nbsp;x <?php echo $item['receiving_quantity'] != 0 ? $item['receiving_quantity'] : 1; ?></td>
diff --git a/application/views/receivings/receiving.php b/application/views/receivings/receiving.php
index fb945dade..b9ea9ea22 100644
--- a/application/views/receivings/receiving.php
+++ b/application/views/receivings/receiving.php
@@ -120,7 +120,7 @@ if (isset($error))
 					<?php echo form_open("receivings/edit_item/$line", array('class'=>'form-horizontal')); ?>
 						<tr>
 							<td><?php echo anchor("receivings/delete_item/$line", '<span class="glyphicon glyphicon-trash"></span>');?></td>
-							<td style="align: center;"><?php echo base64_decode($item['name']); ?><br /> [<?php echo $item['in_stock']; ?> in <?php echo $item['stock_name']; ?>]
+							<td style="align:center;"><?php echo $item['name']; ?><br /> [<?php echo $item['in_stock']; ?> in <?php echo $item['stock_name']; ?>]
 								<?php echo form_hidden('location', $item['item_location']); ?></td>
 
 							<?php 
@@ -186,14 +186,14 @@ if (isset($error))
 								<?php
 								if($item['allow_alt_description']==1)
 								{
-									echo form_input(array('name'=>'description', 'class'=>'form-control input-sm', 'value'=>base64_decode($item['description'])));
+									echo form_input(array('name'=>'description', 'class'=>'form-control input-sm', 'value'=>$item['description']));
 								}
 								else
 								{
-									if (base64_decode($item['description'])!='')
+									if ($item['description']!='')
 									{
-										echo base64_decode($item['description']);
-										echo form_hidden('description',base64_decode($item['description']));
+										echo $item['description'];
+	        							echo form_hidden('description',$item['description']);
 									}
 									else
 									{
diff --git a/application/views/sales/invoice.php b/application/views/sales/invoice.php
index 2d6f1142b..7e462cbcd 100755
--- a/application/views/sales/invoice.php
+++ b/application/views/sales/invoice.php
@@ -75,7 +75,7 @@ if (isset($error_message))
 		?>
 			<tr class="item-row">
 				<td><?php echo $item['item_number']; ?></td>
-				<td class="item-name"><textarea rows="5" cols="6" class='long_name'><?php echo $item['is_serialized'] || $item['allow_alt_description'] && !empty($item['description']) ? base64_decode($item['description']) : base64_decode($item['name']); ?></textarea></td>
+				<td class="item-name"><textarea rows="5" cols="6" class='long_name'><?php echo $item['is_serialized'] || $item['allow_alt_description'] && !empty($item['description']) ? $item['description'] : $item['name']; ?></textarea></td>
 				<td style='text-align:center;'><textarea rows="5" cols="6"><?php echo $item['quantity']; ?></textarea></td>
 				<td><textarea rows="5" cols="6"><?php echo to_currency($item['price']); ?></textarea></td>
 				<td style='text-align:center;'><textarea rows="5" cols="6"><?php echo $item['discount'] .'%'; ?></textarea></td>
diff --git a/application/views/sales/manage.php b/application/views/sales/manage.php
index c910c68fc..9dc4f24cc 100755
--- a/application/views/sales/manage.php
+++ b/application/views/sales/manage.php
@@ -197,12 +197,12 @@ function init_table_sorting()
 
 <div id="title_bar">
 	<div id="title" class="float_left"><?php echo $this->lang->line('common_list_of').' '.$this->lang->line('sales_receipt_number'); ?></div>
-	<a href="javascript:window.print()"><div class="btn btn-info btn-sm pull-right"><span><?php echo $this->lang->line('common_print'); ?></span></div></a>
+	<a href="javascript:window.print()"><div class="btn btn-info btn-sm pull-right print_hide"><span><?php echo $this->lang->line('common_print'); ?></span></div></a>
 </div>
 
 <div id="pagination"><?= $links ?></div>
 
-<div id="titleTextImg">
+<div class="print_hide" id="titleTextImg">
 	<div style="float:left;vertical-align:text-top;"><?php echo $this->lang->line('common_search_options'). ': '; ?></div>
 	<a id="imageDivLink" href="javascript:show_hide_search_filter('search_filter_section', 'imageDivLink');" style="outline:none;">
 	<img src="<?php echo base_url().'images/plus.png'; ?>" style="border:0;outline:none;padding:0px;margin:0px;position:relative;top:-5px;"></a>
@@ -210,7 +210,7 @@ function init_table_sorting()
 
 <?php echo form_open("$controller_name/search", array('id'=>'search_form', 'class'=>'form-horizontal')); ?>
 	<fieldset>
-		<div id="search_filter_section" class="form-group" style="display:none;">
+		<div id="search_filter_section" class="form-group print_show" style="display:none;">
 			<?php echo form_label($this->lang->line('sales_invoice_filter').' '.':', 'invoices_filter');?>
 			<?php echo form_checkbox(array('name'=>'only_invoices','id'=>'only_invoices','value'=>1,'checked'=> isset($only_invoices)?  ( ($only_invoices)? 1 : 0) : 0)) . ' | ';?>
 			<?php echo form_label($this->lang->line('sales_cash_filter').' '.':', 'cash_filter');?>
@@ -222,7 +222,7 @@ function init_table_sorting()
 			<?php echo form_input(array('name'=>'end_date', 'value'=>$end_date, 'class'=>'date_filter', 'size' => '22'));?>
 		</div>
 
-		<div id="table_action_header" class="form-group">
+		<div id="table_action_header" class="form-group print_hide">
 			<ul>
 				<li class="float_left"><?php echo anchor($controller_name . "/delete", '<div class="btn btn-default btn-sm"><span>' . $this->lang->line("common_delete") . '</span></div>', array('id'=>'delete')); ?></li>
 				<!-- li class="float_left"><?php echo anchor($controller_name . "/update_invoice_numbers", '<div class="btn btn-default btn-sm"><span>' . $this->lang->line('sales_invoice_update') . '</span></div>', array('id'=>'update_invoice_numbers')); ?></li -->
diff --git a/application/views/sales/receipt.php b/application/views/sales/receipt.php
index ccba2159b..02d4e27c3 100644
--- a/application/views/sales/receipt.php
+++ b/application/views/sales/receipt.php
@@ -61,7 +61,7 @@ if (isset($error_message))
 	{
 	?>
 		<tr>
-			<td><span class='long_name'> <?php echo ucfirst(base64_decode($item['name'])); ?></span></td>
+			<td><span class='long_name'> <?php echo ucfirst($item['name']); ?></span></td>
 		
 		
 			<td><?php echo to_currency($item['price']); ?></td>
@@ -71,7 +71,7 @@ if (isset($error_message))
 			<td><div class="total-value"><?php echo to_currency($item[($this->Appconfig->get('show_total_discount') ? 'total' : 'discounted_total')]); ?></div></td>
 		</tr>
 	    <tr>
-	    <td colspan="2"><?php echo base64_decode($item['description']); ?></td>
+	    <td colspan="2"><?php echo $item['description']; ?></td>
 		<td ><?php echo $item['serialnumber']; ?></td>
 	    </tr>
 	    <?php if ($item['discount'] > 0) : ?>
diff --git a/application/views/sales/register.php b/application/views/sales/register.php
index 487866be9..df810397e 100644
--- a/application/views/sales/register.php
+++ b/application/views/sales/register.php
@@ -127,7 +127,7 @@ if (isset($success))
 						<tr>
 							<td><?php echo anchor("sales/delete_item/$line", '<span class="glyphicon glyphicon-trash"></span>');?></td>
 							<td><?php echo $item['item_number']; ?></td>
-							<td style="align: center;"><?php echo base64_decode($item['name']); ?><br /> [<?php echo $item['in_stock'] ?> in <?php echo $item['stock_name']; ?>]
+							<td style="align: center;"><?php echo $item['name']; ?><br /> [<?php echo $item['in_stock'] ?> in <?php echo $item['stock_name']; ?>]
 								<?php echo form_hidden('location', $item['item_location']); ?>
 							</td>
 
@@ -179,14 +179,14 @@ if (isset($success))
 								<?php
 								if($item['allow_alt_description']==1)
 								{
-									echo form_input(array('name'=>'description', 'class'=>'form-control input-sm', 'value'=>base64_decode($item['description'])));
+									echo form_input(array('name'=>'description', 'class'=>'form-control input-sm', 'value'=>$item['description']));
 								}
 								else
 								{
-									if (base64_decode($item['description'])!='')
+									if ($item['description']!='')
 									{
-										echo base64_decode($item['description']);
-										echo form_hidden('description', base64_decode($item['description']));
+										echo $item['description'];
+										echo form_hidden('description', $item['description']);
 									}
 									else
 									{
diff --git a/css/ospos_print.css b/css/ospos_print.css
index 1554bfa72..163272add 100644
--- a/css/ospos_print.css
+++ b/css/ospos_print.css
@@ -65,4 +65,13 @@
 		/*display:none;*/
 	}
 
-}
+	.print_show 
+	{
+		display:block !important; 
+	}
+
+	.print_hide
+	{
+		display:none !important;
+	}
+}
\ No newline at end of file
diff --git a/dist/opensourcepos.min.css b/dist/opensourcepos.min.css
index 9e3254382..640632f1e 100644
--- a/dist/opensourcepos.min.css
+++ b/dist/opensourcepos.min.css
@@ -15,4 +15,4 @@
  * Licensed under the Apache License v2.0
  * http://www.apache.org/licenses/LICENSE-2.0
  *
- */.datetimepicker{padding:4px;margin-top:1px;-webkit-border-radius:4px;-moz-border-radius:4px;border-radius:4px;direction:ltr}.datetimepicker-inline{width:220px}.datetimepicker.datetimepicker-rtl{direction:rtl}.datetimepicker.datetimepicker-rtl table tr td span{float:right}.datetimepicker-dropdown,.datetimepicker-dropdown-left{top:0;left:0}[class*=" datetimepicker-dropdown"]:before{content:'';display:inline-block;border-left:7px solid transparent;border-right:7px solid transparent;border-bottom:7px solid #ccc;border-bottom-color:rgba(0,0,0,.2);position:absolute}[class*=" datetimepicker-dropdown"]:after{border-bottom:6px solid #fff;position:absolute}[class*=" datetimepicker-dropdown-top"]:before{content:'';display:inline-block;border-left:7px solid transparent;border-right:7px solid transparent;border-top:7px solid #ccc;border-top-color:rgba(0,0,0,.2);border-bottom:0}[class*=" datetimepicker-dropdown-top"]:after{border-top:6px solid #fff;border-bottom:0}.datetimepicker-dropdown-bottom-left:before{top:-7px;right:6px}.datetimepicker-dropdown-bottom-left:after{top:-6px;right:7px}.datetimepicker-dropdown-bottom-right:before{top:-7px;left:6px}.datetimepicker-dropdown-bottom-right:after{top:-6px;left:7px}.datetimepicker-dropdown-top-left:before{bottom:-7px;right:6px}.datetimepicker-dropdown-top-left:after{bottom:-6px;right:7px}.datetimepicker-dropdown-top-right:before{bottom:-7px;left:6px}.datetimepicker-dropdown-top-right:after{bottom:-6px;left:7px}.datetimepicker>div{display:none}.datetimepicker.days div.datetimepicker-days,.datetimepicker.hours div.datetimepicker-hours,.datetimepicker.minutes div.datetimepicker-minutes,.datetimepicker.months div.datetimepicker-months,.datetimepicker.years div.datetimepicker-years{display:block}.datetimepicker table{margin:0}.datetimepicker td,.datetimepicker th{text-align:center;width:20px;height:20px;-webkit-border-radius:4px;-moz-border-radius:4px;border-radius:4px;border:0}.table-striped .datetimepicker table tr td,.table-striped .datetimepicker table tr th{background-color:transparent}.datetimepicker table tr td.day:hover,.datetimepicker table tr td.hour:hover,.datetimepicker table tr td.minute:hover{background:#eee;cursor:pointer}.datetimepicker table tr td.new,.datetimepicker table tr td.old{color:#999}.datetimepicker table tr td.disabled,.datetimepicker table tr td.disabled:hover{background:0;color:#999;cursor:default}.datetimepicker table tr td.today,.datetimepicker table tr td.today.disabled,.datetimepicker table tr td.today.disabled:hover,.datetimepicker table tr td.today:hover{background-color:#fde19a;background-image:-moz-linear-gradient(top,#fdd49a,#fdf59a);background-image:-ms-linear-gradient(top,#fdd49a,#fdf59a);background-image:-webkit-gradient(linear,0 0,0 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diff --git a/dist/opensourcepos.min.js b/dist/opensourcepos.min.js
index 23eb838f7..4cc17aeb0 100644
--- a/dist/opensourcepos.min.js
+++ b/dist/opensourcepos.min.js
@@ -1,4 +1,4 @@
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+/*! opensourcepos 13-03-2016 */
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c,"string"===f&&(e=Ka.exec(c))&&e[1]&&(c=m(a,b,e),f="number"),null!=c&&c===c&&("number"===f&&(c+=e&&e[3]||(na.cssNumber[h]?"":"px")),la.clearCloneStyle||""!==c||0!==b.indexOf("background")||(i[b]="inherit"),!(g&&"set"in g&&void 0===(c=g.set(a,c,d)))))try{i[b]=c}catch(j){}}},css:function(a,b,c,d){var e,f,g,h=na.camelCase(b);return b=na.cssProps[h]||(na.cssProps[h]=G(h)||h),g=na.cssHooks[b]||na.cssHooks[h],g&&"get"in g&&(f=g.get(a,!0,c)),void 0===f&&(f=pb(a,b,d)),"normal"===f&&b in wb&&(f=wb[b]),""===c||c?(e=parseFloat(f),c===!0||isFinite(e)?e||0:f):f}}),na.each(["height","width"],function(a,b){na.cssHooks[b]={get:function(a,c,d){return c?tb.test(na.css(a,"display"))&&0===a.offsetWidth?mb(a,vb,function(){return K(a,b,d)}):K(a,b,d):void 0},set:function(a,c,d){var e=d&&ob(a);return I(a,c,d?J(a,b,d,la.boxSizing&&"border-box"===na.css(a,"boxSizing",!1,e),e):0)}}}),la.opacity||(na.cssHooks.opacity={get:function(a,b){return sb.test((b&&a.currentStyle?a.currentStyle.filter:a.style.filter)||"")?.01*parseFloat(RegExp.$1)+"":b?"1":""},set:function(a,b){var c=a.style,d=a.currentStyle,e=na.isNumeric(b)?"alpha(opacity="+100*b+")":"",f=d&&d.filter||c.filter||"";c.zoom=1,(b>=1||""===b)&&""===na.trim(f.replace(rb,""))&&c.removeAttribute&&(c.removeAttribute("filter"),""===b||d&&!d.filter)||(c.filter=rb.test(f)?f.replace(rb,e):f+" "+e)}}),na.cssHooks.marginRight=F(la.reliableMarginRight,function(a,b){return b?mb(a,{display:"inline-block"},pb,[a,"marginRight"]):void 0}),na.cssHooks.marginLeft=F(la.reliableMarginLeft,function(a,b){return b?(parseFloat(pb(a,"marginLeft"))||(na.contains(a.ownerDocument,a)?a.getBoundingClientRect().left-mb(a,{marginLeft:0},function(){return a.getBoundingClientRect().left}):0))+"px":void 0}),na.each({margin:"",padding:"",border:"Width"},function(a,b){na.cssHooks[a+b]={expand:function(c){for(var d=0,e={},f="string"==typeof c?c.split(" "):[c];4>d;d++)e[a+La[d]+b]=f[d]||f[d-2]||f[0];return 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this.pos=b=this.options.duration?na.easing[this.easing](a,this.options.duration*a,0,1,this.options.duration):a,this.now=(this.end-this.start)*b+this.start,this.options.step&&this.options.step.call(this.elem,this.now,this),c&&c.set?c.set(this):L.propHooks._default.set(this),this}},L.prototype.init.prototype=L.prototype,L.propHooks={_default:{get:function(a){var b;return 1!==a.elem.nodeType||null!=a.elem[a.prop]&&null==a.elem.style[a.prop]?a.elem[a.prop]:(b=na.css(a.elem,a.prop,""),b&&"auto"!==b?b:0)},set:function(a){na.fx.step[a.prop]?na.fx.step[a.prop](a):1!==a.elem.nodeType||null==a.elem.style[na.cssProps[a.prop]]&&!na.cssHooks[a.prop]?a.elem[a.prop]=a.now:na.style(a.elem,a.prop,a.now+a.unit)}}},L.propHooks.scrollTop=L.propHooks.scrollLeft={set:function(a){a.elem.nodeType&&a.elem.parentNode&&(a.elem[a.prop]=a.now)}},na.easing={linear:function(a){return a},swing:function(a){return.5-Math.cos(a*Math.PI)/2},_default:"swing"},na.fx=L.prototype.init,na.fx.step={};var zb,Ab,Bb=/^(?:toggle|show|hide)$/,Cb=/queueHooks$/;na.Animation=na.extend(R,{tweeners:{"*":[function(a,b){var c=this.createTween(a,b);return m(c.elem,a,Ka.exec(b),c),c}]},tweener:function(a,b){na.isFunction(a)?(b=a,a=["*"]):a=a.match(Da);for(var c,d=0,e=a.length;e>d;d++)c=a[d],R.tweeners[c]=R.tweeners[c]||[],R.tweeners[c].unshift(b)},prefilters:[P],prefilter:function(a,b){b?R.prefilters.unshift(a):R.prefilters.push(a)}}),na.speed=function(a,b,c){var d=a&&"object"==typeof a?na.extend({},a):{complete:c||!c&&b||na.isFunction(a)&&a,duration:a,easing:c&&b||b&&!na.isFunction(b)&&b};return d.duration=na.fx.off?0:"number"==typeof d.duration?d.duration:d.duration in na.fx.speeds?na.fx.speeds[d.duration]:na.fx.speeds._default,(null==d.queue||d.queue===!0)&&(d.queue="fx"),d.old=d.complete,d.complete=function(){na.isFunction(d.old)&&d.old.call(this),d.queue&&na.dequeue(this,d.queue)},d},na.fn.extend({fadeTo:function(a,b,c,d){return this.filter(Ma).css("opacity",0).show().end().animate({opacity:b},a,c,d)},animate:function(a,b,c,d){var e=na.isEmptyObject(a),f=na.speed(b,c,d),g=function(){var b=R(this,na.extend({},a),f);(e||na._data(this,"finish"))&&b.stop(!0)};return g.finish=g,e||f.queue===!1?this.each(g):this.queue(f.queue,g)},stop:function(a,b,c){var d=function(a){var b=a.stop;delete a.stop,b(c)};return"string"!=typeof a&&(c=b,b=a,a=void 0),b&&a!==!1&&this.queue(a||"fx",[]),this.each(function(){var b=!0,e=null!=a&&a+"queueHooks",f=na.timers,g=na._data(this);if(e)g[e]&&g[e].stop&&d(g[e]);else for(e in g)g[e]&&g[e].stop&&Cb.test(e)&&d(g[e]);for(e=f.length;e--;)f[e].elem!==this||null!=a&&f[e].queue!==a||(f[e].anim.stop(c),b=!1,f.splice(e,1));(b||!c)&&na.dequeue(this,a)})},finish:function(a){return a!==!1&&(a=a||"fx"),this.each(function(){var 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type='checkbox'/>",a=c.getElementsByTagName("a")[0],b.setAttribute("type","checkbox"),c.appendChild(b),a=c.getElementsByTagName("a")[0],a.style.cssText="top:1px",la.getSetAttribute="t"!==c.className,la.style=/top/.test(a.getAttribute("style")),la.hrefNormalized="/a"===a.getAttribute("href"),la.checkOn=!!b.value,la.optSelected=e.selected,la.enctype=!!da.createElement("form").enctype,d.disabled=!0,la.optDisabled=!e.disabled,b=da.createElement("input"),b.setAttribute("value",""),la.input=""===b.getAttribute("value"),b.value="t",b.setAttribute("type","radio"),la.radioValue="t"===b.value}();var Db=/\r/g;na.fn.extend({val:function(a){var b,c,d,e=this[0];{if(arguments.length)return d=na.isFunction(a),this.each(function(c){var e;1===this.nodeType&&(e=d?a.call(this,c,na(this).val()):a,null==e?e="":"number"==typeof e?e+="":na.isArray(e)&&(e=na.map(e,function(a){return null==a?"":a+""})),b=na.valHooks[this.type]||na.valHooks[this.nodeName.toLowerCase()],b&&"set"in b&&void 0!==b.set(this,e,"value")||(this.value=e))});if(e)return b=na.valHooks[e.type]||na.valHooks[e.nodeName.toLowerCase()],b&&"get"in b&&void 0!==(c=b.get(e,"value"))?c:(c=e.value,"string"==typeof c?c.replace(Db,""):null==c?"":c)}}}),na.extend({valHooks:{option:{get:function(a){var b=na.find.attr(a,"value");return null!=b?b:na.trim(na.text(a))}},select:{get:function(a){for(var b,c,d=a.options,e=a.selectedIndex,f="select-one"===a.type||0>e,g=f?null:[],h=f?e+1:d.length,i=0>e?h:f?e:0;h>i;i++)if(c=d[i],!(!c.selected&&i!==e||(la.optDisabled?c.disabled:null!==c.getAttribute("disabled"))||c.parentNode.disabled&&na.nodeName(c.parentNode,"optgroup"))){if(b=na(c).val(),f)return b;g.push(b)}return g},set:function(a,b){for(var c,d,e=a.options,f=na.makeArray(b),g=e.length;g--;)if(d=e[g],na.inArray(na.valHooks.option.get(d),f)>=0)try{d.selected=c=!0}catch(h){d.scrollHeight}else d.selected=!1;return c||(a.selectedIndex=-1),e}}}}),na.each(["radio","checkbox"],function(){na.valHooks[this]={set:function(a,b){return na.isArray(b)?a.checked=na.inArray(na(a).val(),b)>-1:void 0}},la.checkOn||(na.valHooks[this].get=function(a){return null===a.getAttribute("value")?"on":a.value})});var Eb,Fb,Gb=na.expr.attrHandle,Hb=/^(?:checked|selected)$/i,Ib=la.getSetAttribute,Jb=la.input;na.fn.extend({attr:function(a,b){return Na(this,na.attr,a,b,arguments.length>1)},removeAttr:function(a){return this.each(function(){na.removeAttr(this,a)})}}),na.extend({attr:function(a,b,c){var d,e,f=a.nodeType;if(3!==f&&8!==f&&2!==f)return"undefined"==typeof a.getAttribute?na.prop(a,b,c):(1===f&&na.isXMLDoc(a)||(b=b.toLowerCase(),e=na.attrHooks[b]||(na.expr.match.bool.test(b)?Fb:Eb)),void 0!==c?null===c?void na.removeAttr(a,b):e&&"set"in e&&void 0!==(d=e.set(a,c,b))?d:(a.setAttribute(b,c+""),c):e&&"get"in e&&null!==(d=e.get(a,b))?d:(d=na.find.attr(a,b),null==d?void 0:d))},attrHooks:{type:{set:function(a,b){if(!la.radioValue&&"radio"===b&&na.nodeName(a,"input")){var c=a.value;return a.setAttribute("type",b),c&&(a.value=c),b}}}},removeAttr:function(a,b){var c,d,e=0,f=b&&b.match(Da);if(f&&1===a.nodeType)for(;c=f[e++];)d=na.propFix[c]||c,na.expr.match.bool.test(c)?Jb&&Ib||!Hb.test(c)?a[d]=!1:a[na.camelCase("default-"+c)]=a[d]=!1:na.attr(a,c,""),a.removeAttribute(Ib?c:d)}}),Fb={set:function(a,b,c){return b===!1?na.removeAttr(a,c):Jb&&Ib||!Hb.test(c)?a.setAttribute(!Ib&&na.propFix[c]||c,c):a[na.camelCase("default-"+c)]=a[c]=!0,c}},na.each(na.expr.match.bool.source.match(/\w+/g),function(a,b){var c=Gb[b]||na.find.attr;Gb[b]=Jb&&Ib||!Hb.test(b)?function(a,b,d){var e,f;return d||(f=Gb[b],Gb[b]=e,e=null!=c(a,b,d)?b.toLowerCase():null,Gb[b]=f),e}:function(a,b,c){return c?void 0:a[na.camelCase("default-"+b)]?b.toLowerCase():null}}),Jb&&Ib||(na.attrHooks.value={set:function(a,b,c){return na.nodeName(a,"input")?void(a.defaultValue=b):Eb&&Eb.set(a,b,c)}}),Ib||(Eb={set:function(a,b,c){var d=a.getAttributeNode(c);return d||a.setAttributeNode(d=a.ownerDocument.createAttribute(c)),d.value=b+="","value"===c||b===a.getAttribute(c)?b:void 0}},Gb.id=Gb.name=Gb.coords=function(a,b,c){var d;return c?void 0:(d=a.getAttributeNode(b))&&""!==d.value?d.value:null},na.valHooks.button={get:function(a,b){var c=a.getAttributeNode(b);return c&&c.specified?c.value:void 0},set:Eb.set},na.attrHooks.contenteditable={set:function(a,b,c){Eb.set(a,""===b?!1:b,c)}},na.each(["width","height"],function(a,b){na.attrHooks[b]={set:function(a,c){return""===c?(a.setAttribute(b,"auto"),c):void 0}}})),la.style||(na.attrHooks.style={get:function(a){return a.style.cssText||void 0},set:function(a,b){return a.style.cssText=b+""}});var Kb=/^(?:input|select|textarea|button|object)$/i,Lb=/^(?:a|area)$/i;na.fn.extend({prop:function(a,b){return Na(this,na.prop,a,b,arguments.length>1)},removeProp:function(a){return a=na.propFix[a]||a,this.each(function(){try{this[a]=void 0,delete this[a]}catch(b){}})}}),na.extend({prop:function(a,b,c){var d,e,f=a.nodeType;if(3!==f&&8!==f&&2!==f)return 1===f&&na.isXMLDoc(a)||(b=na.propFix[b]||b,e=na.propHooks[b]),void 0!==c?e&&"set"in e&&void 0!==(d=e.set(a,c,b))?d:a[b]=c:e&&"get"in e&&null!==(d=e.get(a,b))?d:a[b]},propHooks:{tabIndex:{get:function(a){var b=na.find.attr(a,"tabindex");return b?parseInt(b,10):Kb.test(a.nodeName)||Lb.test(a.nodeName)&&a.href?0:-1}}},propFix:{"for":"htmlFor","class":"className"}}),la.hrefNormalized||na.each(["href","src"],function(a,b){na.propHooks[b]={get:function(a){return a.getAttribute(b,4)}}}),la.optSelected||(na.propHooks.selected={get:function(a){var b=a.parentNode;return 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diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 053510334..94d34c3fd 100644
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -55,7 +55,7 @@ defined('BASEPATH') OR exit('No direct script access allowed');
  * @var	string
  *
  */
-	define('CI_VERSION', '3.0.4');
+	define('CI_VERSION', '3.0.5');
 
 /*
  * ------------------------------------------------------
@@ -359,7 +359,7 @@ if ( ! is_php('5.4'))
 	 *
 	 * Returns current CI instance object
 	 *
-	 * @return object
+	 * @return CI_Controller
 	 */
 	function &get_instance()
 	{
diff --git a/system/core/Loader.php b/system/core/Loader.php
index 37d1ecaf9..c742ae71a 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -321,7 +321,7 @@ class CI_Loader {
 		}
 
 		$model = ucfirst($model);
-		if ( ! class_exists($model))
+		if ( ! class_exists($model, FALSE))
 		{
 			foreach ($this->_ci_model_paths as $mod_path)
 			{
@@ -718,9 +718,16 @@ class CI_Loader {
 	{
 		if (is_array($library))
 		{
-			foreach ($library as $driver)
+			foreach ($library as $key => $value)
 			{
-				$this->driver($driver);
+				if (is_int($key))
+				{
+					$this->driver($value, $params);
+				}
+				else
+				{
+					$this->driver($key, $params, $value);
+				}
 			}
 
 			return $this;
@@ -929,6 +936,14 @@ class CI_Loader {
 		 */
 		if (is_array($_ci_vars))
 		{
+			foreach (array_keys($_ci_vars) as $key)
+			{
+				if (strncmp($key, '_ci_', 4) === 0)
+				{
+					unset($_ci_vars[$key]);
+				}
+			}
+
 			$this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);
 		}
 		extract($this->_ci_cached_vars);
@@ -1334,10 +1349,7 @@ class CI_Loader {
 		// Autoload drivers
 		if (isset($autoload['drivers']))
 		{
-			foreach ($autoload['drivers'] as $item)
-			{
-				$this->driver($item);
-			}
+			$this->driver($autoload['drivers']);
 		}
 
 		// Load libraries
diff --git a/system/core/Log.php b/system/core/Log.php
index 72d3cfbae..1abdaa00e 100644
--- a/system/core/Log.php
+++ b/system/core/Log.php
@@ -154,8 +154,8 @@ class CI_Log {
 	 *
 	 * Generally this function will be called using the global log_message() function
 	 *
-	 * @param	string	the error level: 'error', 'debug' or 'info'
-	 * @param	string	the error message
+	 * @param	string	$level 	The error level: 'error', 'debug' or 'info'
+	 * @param	string	$msg 	The error message
 	 * @return	bool
 	 */
 	public function write_log($level, $msg)
@@ -191,6 +191,8 @@ class CI_Log {
 			return FALSE;
 		}
 
+		flock($fp, LOCK_EX);
+
 		// Instantiating DateTime with microseconds appended to initial date is needed for proper support of this format
 		if (strpos($this->_date_fmt, 'u') !== FALSE)
 		{
@@ -204,9 +206,7 @@ class CI_Log {
 			$date = date($this->_date_fmt);
 		}
 
-		$message .= $level.' - '.$date.' --> '.$msg."\n";
-
-		flock($fp, LOCK_EX);
+		$message .= $this->_format_line($level, $date, $msg);
 
 		for ($written = 0, $length = strlen($message); $written < $length; $written += $result)
 		{
@@ -227,4 +227,21 @@ class CI_Log {
 		return is_int($result);
 	}
 
+	// --------------------------------------------------------------------
+
+	/**
+	 * Format the log line.
+	 *
+	 * This is for extensibility of log formatting
+	 * If you want to change the log format, extend the CI_Log class and override this method
+	 *
+	 * @param	string	$level 	The error level
+	 * @param	string	$date 	Formatted date string
+	 * @param	string	$msg 	The log message
+	 * @return	string	Formatted log line with a new line character '\n' at the end
+	 */
+	protected function _format_line($level, $date, $message)
+	{
+		return $level.' - '.$date.' --> '.$message."\n";
+	}
 }
diff --git a/system/core/Output.php b/system/core/Output.php
index ad87f8545..ec9c21b91 100644
--- a/system/core/Output.php
+++ b/system/core/Output.php
@@ -377,7 +377,7 @@ class CI_Output {
 	/**
 	 * Set Cache
 	 *
-	 * @param	int	$time	Cache expiration time in seconds
+	 * @param	int	$time	Cache expiration time in minutes
 	 * @return	CI_Output
 	 */
 	public function cache($time)
diff --git a/system/core/Security.php b/system/core/Security.php
index bad511dd3..d5305d1ca 100644
--- a/system/core/Security.php
+++ b/system/core/Security.php
@@ -762,7 +762,14 @@ class CI_Security {
 	 */
 	public function strip_image_tags($str)
 	{
-		return preg_replace(array('#<img[\s/]+.*?src\s*=\s*["\'](.+?)["\'].*?\>#', '#<img[\s/]+.*?src\s*=\s*(.+?).*?\>#'), '\\1', $str);
+		return preg_replace(
+			array(
+				'#<img[\s/]+.*?src\s*=\s*(["\'])([^\\1]+?)\\1.*?\>#i',
+				'#<img[\s/]+.*?src\s*=\s*?(([^\s"\'=<>`]+)).*?\>#i'
+			),
+			'\\2',
+			$str
+		);
 	}
 
 	// ----------------------------------------------------------------
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index df0ce6a9b..848516adc 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1566,11 +1566,11 @@ abstract class CI_DB_driver {
 				'\s*>\s*',                       // >
 				'\s+IS NULL',                    // IS NULL
 				'\s+IS NOT NULL',                // IS NOT NULL
-				'\s+EXISTS\s*\([^\)]+\)',        // EXISTS(sql)
-				'\s+NOT EXISTS\s*\([^\)]+\)',    // NOT EXISTS(sql)
+				'\s+EXISTS\s*\(.*\)',        // EXISTS(sql)
+				'\s+NOT EXISTS\s*\(.*\)',    // NOT EXISTS(sql)
 				'\s+BETWEEN\s+',                 // BETWEEN value AND value
-				'\s+IN\s*\([^\)]+\)',            // IN(list)
-				'\s+NOT IN\s*\([^\)]+\)',        // NOT IN (list)
+				'\s+IN\s*\(.*\)',            // IN(list)
+				'\s+NOT IN\s*\(.*\)',        // NOT IN (list)
 				'\s+LIKE\s+\S.*('.$_les.')?',    // LIKE 'expr'[ ESCAPE '%s']
 				'\s+NOT LIKE\s+\S.*('.$_les.')?' // NOT LIKE 'expr'[ ESCAPE '%s']
 			);
@@ -1793,7 +1793,7 @@ abstract class CI_DB_driver {
 	 * the table prefix onto it. Some logic is necessary in order to deal with
 	 * column names that include the path. Consider a query like this:
 	 *
-	 * SELECT * FROM hostname.database.table.column AS c FROM hostname.database.table
+	 * SELECT hostname.database.table.column AS c FROM hostname.database.table
 	 *
 	 * Or a query with aliasing:
 	 *
diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
index e92c57091..c862d937d 100644
--- a/system/database/DB_query_builder.php
+++ b/system/database/DB_query_builder.php
@@ -531,40 +531,47 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 
 		is_bool($escape) OR $escape = $this->_protect_identifiers;
 
-		// Split multiple conditions
-		if ($escape === TRUE && preg_match_all('/\sAND\s|\sOR\s/i', $cond, $m, PREG_OFFSET_CAPTURE))
-		{
-			$newcond = '';
-			$m[0][] = array('', strlen($cond));
-
-			for ($i = 0, $c = count($m[0]), $s = 0;
-				$i < $c;
-				$s = $m[0][$i][1] + strlen($m[0][$i][0]), $i++)
-			{
-				$temp = substr($cond, $s, ($m[0][$i][1] - $s));
-
-				$newcond .= preg_match("/([\[\]\w\.'-]+)(\s*[^\"\[`'\w]+\s*)(.+)/i", $temp, $match)
-						? $this->protect_identifiers($match[1]).$match[2].$this->protect_identifiers($match[3])
-						: $temp;
-
-				$newcond .= $m[0][$i][0];
-			}
-
-			$cond = ' ON '.$newcond;
-		}
-		// Split apart the condition and protect the identifiers
-		elseif ($escape === TRUE && preg_match("/([\[\]\w\.'-]+)(\s*[^\"\[`'\w]+\s*)(.+)/i", $cond, $match))
-		{
-			$cond = ' ON '.$this->protect_identifiers($match[1]).$match[2].$this->protect_identifiers($match[3]);
-		}
-		elseif ( ! $this->_has_operator($cond))
+		if ( ! $this->_has_operator($cond))
 		{
 			$cond = ' USING ('.($escape ? $this->escape_identifiers($cond) : $cond).')';
 		}
-		else
+		elseif ($escape === FALSE)
 		{
 			$cond = ' ON '.$cond;
 		}
+		else
+		{
+			// Split multiple conditions
+			if (preg_match_all('/\sAND\s|\sOR\s/i', $cond, $joints, PREG_OFFSET_CAPTURE))
+			{
+				$conditions = array();
+				$joints = $joints[0];
+				array_unshift($joints, array('', 0));
+
+				for ($i = count($joints) - 1, $pos = strlen($cond); $i >= 0; $i--)
+				{
+					$joints[$i][1] += strlen($joints[$i][0]); // offset
+					$conditions[$i] = substr($cond, $joints[$i][1], $pos - $joints[$i][1]);
+					$pos = $joints[$i][1] - strlen($joints[$i][0]);
+					$joints[$i] = $joints[$i][0];
+				}
+			}
+			else
+			{
+				$conditions = array($cond);
+				$joints = array('');
+			}
+
+			$cond = ' ON ';
+			for ($i = 0, $c = count($conditions); $i < $c; $i++)
+			{
+				$operator = $this->_get_operator($conditions[$i]);
+				$cond .= $joints[$i];
+				$cond .= preg_match("/(\(*)?([\[\]\w\.'-]+)".preg_quote($operator)."(.*)/i", $conditions[$i], $match)
+					? $match[1].$this->protect_identifiers($match[2]).$operator.$this->protect_identifiers($match[3])
+					: $conditions[$i];
+			}
+		}
 
 		// Do we want to escape the table name?
 		if ($escape === TRUE)
@@ -1138,7 +1145,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	string	$key
 	 * @param	string	$value
 	 * @param	bool	$escape
-	 * @return	object
+	 * @return	CI_DB_query_builder
 	 */
 	public function having($key, $value = NULL, $escape = NULL)
 	{
@@ -1155,7 +1162,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	string	$key
 	 * @param	string	$value
 	 * @param	bool	$escape
-	 * @return	object
+	 * @return	CI_DB_query_builder
 	 */
 	public function or_having($key, $value = NULL, $escape = NULL)
 	{
@@ -1339,7 +1346,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	string	the table
 	 * @param	string	the limit clause
 	 * @param	string	the offset clause
-	 * @return	object
+	 * @return	CI_DB_result
 	 */
 	public function get($table = '', $limit = NULL, $offset = NULL)
 	{
@@ -1379,7 +1386,16 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 			$this->from($table);
 		}
 
-		$result = ($this->qb_distinct === TRUE OR ! empty($this->qb_orderby))
+		// ORDER BY usage is often problematic here (most notably
+		// on Microsoft SQL Server) and ultimately unnecessary
+		// for selecting COUNT(*) ...
+		if ( ! empty($this->qb_orderby))
+		{
+			$orderby = $this->qb_orderby;
+			$this->qb_orderby = NULL;
+		}
+
+		$result = ($this->qb_distinct === TRUE)
 			? $this->query($this->_count_string.$this->protect_identifiers('numrows')."\nFROM (\n".$this->_compile_select()."\n) CI_count_all_results")
 			: $this->query($this->_compile_select($this->_count_string.$this->protect_identifiers('numrows')));
 
@@ -1387,6 +1403,11 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 		{
 			$this->_reset_select();
 		}
+		// If we've previously reset the qb_orderby values, get them back
+		elseif ( ! isset($this->qb_orderby))
+		{
+			$this->qb_orderby = $orderby;
+		}
 
 		if ($result->num_rows() === 0)
 		{
@@ -1408,7 +1429,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	string	$where
 	 * @param	int	$limit
 	 * @param	int	$offset
-	 * @return	object
+	 * @return	CI_DB_result
 	 */
 	public function get_where($table = '', $where = NULL, $limit = NULL, $offset = NULL)
 	{
@@ -1444,20 +1465,26 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	bool	$escape	Whether to escape values and identifiers
 	 * @return	int	Number of rows inserted or FALSE on failure
 	 */
-	public function insert_batch($table = '', $set = NULL, $escape = NULL)
+	public function insert_batch($table, $set = NULL, $escape = NULL, $batch_size = 100)
 	{
-		if ($set !== NULL)
+		if ($set === NULL)
 		{
+			if (empty($this->qb_set))
+			{
+				return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;
+			}
+		}
+		else
+		{
+			if (empty($set))
+			{
+				return ($this->db_debug) ? $this->display_error('insert_batch() called with no data') : FALSE;
+			}
+
 			$this->set_insert_batch($set, '', $escape);
 		}
 
-		if (count($this->qb_set) === 0)
-		{
-			// No valid data array. Folds in cases where keys and values did not match up
-			return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;
-		}
-
-		if ($table === '')
+		if (strlen($table) === 0)
 		{
 			if ( ! isset($this->qb_from[0]))
 			{
@@ -1469,9 +1496,9 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 
 		// Batch this baby
 		$affected_rows = 0;
-		for ($i = 0, $total = count($this->qb_set); $i < $total; $i += 100)
+		for ($i = 0, $total = count($this->qb_set); $i < $total; $i += $batch_size)
 		{
-			$this->query($this->_insert_batch($this->protect_identifiers($table, TRUE, $escape, FALSE), $this->qb_keys, array_slice($this->qb_set, $i, 100)));
+			$this->query($this->_insert_batch($this->protect_identifiers($table, TRUE, $escape, FALSE), $this->qb_keys, array_slice($this->qb_set, $i, $batch_size)));
 			$affected_rows += $this->affected_rows();
 		}
 
@@ -1598,7 +1625,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	string	the table to insert data into
 	 * @param	array	an associative array of insert values
 	 * @param	bool	$escape	Whether to escape values and identifiers
-	 * @return	object
+	 * @return	bool	TRUE on success, FALSE on failure
 	 */
 	public function insert($table = '', $set = NULL, $escape = NULL)
 	{
@@ -1664,7 +1691,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 *
 	 * @param	string	the table to replace data into
 	 * @param	array	an associative array of insert values
-	 * @return	object
+	 * @return	bool	TRUE on success, FALSE on failure
 	 */
 	public function replace($table = '', $set = NULL)
 	{
@@ -1770,7 +1797,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	array	$set	An associative array of update values
 	 * @param	mixed	$where
 	 * @param	int	$limit
-	 * @return	object
+	 * @return	bool	TRUE on success, FALSE on failure
 	 */
 	public function update($table = '', $set = NULL, $where = NULL, $limit = NULL)
 	{
@@ -1845,7 +1872,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * @param	string	the where key
 	 * @return	int	number of rows affected or FALSE on failure
 	 */
-	public function update_batch($table = '', $set = NULL, $index = NULL)
+	public function update_batch($table, $set = NULL, $index = NULL, $batch_size = 100)
 	{
 		// Combine any cached components with the current statements
 		$this->_merge_cache();
@@ -1855,17 +1882,24 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 			return ($this->db_debug) ? $this->display_error('db_must_use_index') : FALSE;
 		}
 
-		if ($set !== NULL)
+		if ($set === NULL)
 		{
+			if (empty($this->qb_set))
+			{
+				return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;
+			}
+		}
+		else
+		{
+			if (empty($set))
+			{
+				return ($this->db_debug) ? $this->display_error('update_batch() called with no data') : FALSE;
+			}
+
 			$this->set_update_batch($set, $index);
 		}
 
-		if (count($this->qb_set) === 0)
-		{
-			return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;
-		}
-
-		if ($table === '')
+		if (strlen($table) === 0)
 		{
 			if ( ! isset($this->qb_from[0]))
 			{
@@ -1877,9 +1911,9 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 
 		// Batch this baby
 		$affected_rows = 0;
-		for ($i = 0, $total = count($this->qb_set); $i < $total; $i += 100)
+		for ($i = 0, $total = count($this->qb_set); $i < $total; $i += $batch_size)
 		{
-			$this->query($this->_update_batch($this->protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->qb_set, $i, 100), $this->protect_identifiers($index)));
+			$this->query($this->_update_batch($this->protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->qb_set, $i, $batch_size), $this->protect_identifiers($index)));
 			$affected_rows += $this->affected_rows();
 			$this->qb_where = array();
 		}
@@ -1983,7 +2017,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * Compiles a delete string and runs "DELETE FROM table"
 	 *
 	 * @param	string	the table to empty
-	 * @return	object
+	 * @return	bool	TRUE on success, FALSE on failure
 	 */
 	public function empty_table($table = '')
 	{
@@ -2016,7 +2050,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 * This function maps to "DELETE FROM table"
 	 *
 	 * @param	string	the table to truncate
-	 * @return	object
+	 * @return	bool	TRUE on success, FALSE on failure
 	 */
 	public function truncate($table = '')
 	{
@@ -2316,7 +2350,7 @@ abstract class CI_DB_query_builder extends CI_DB_driver {
 	 *
 	 * Escapes identifiers in WHERE and HAVING statements at execution time.
 	 *
-	 * Required so that aliases are tracked properly, regardless of wether
+	 * Required so that aliases are tracked properly, regardless of whether
 	 * where(), or_where(), having(), or_having are called prior to from(),
 	 * join() and dbprefix is added only if needed.
 	 *
diff --git a/system/database/drivers/ibase/ibase_driver.php b/system/database/drivers/ibase/ibase_driver.php
index cbc1022ff..c1055c1e6 100644
--- a/system/database/drivers/ibase/ibase_driver.php
+++ b/system/database/drivers/ibase/ibase_driver.php
@@ -126,7 +126,7 @@ class CI_DB_ibase_driver extends CI_DB {
 	 */
 	protected function _execute($sql)
 	{
-		return ibase_query($this->conn_id, $sql);
+		return ibase_query(isset($this->_ibase_trans) ? $this->_ibase_trans : $this->conn_id, $sql);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php
index fd1b8f1ed..3c1e006f8 100644
--- a/system/helpers/captcha_helper.php
+++ b/system/helpers/captcha_helper.php
@@ -171,35 +171,36 @@ if ( ! function_exists('create_captcha'))
 				$byte_index = $word_index = 0;
 				while ($word_index < $word_length)
 				{
+					// Do we have more random data to use?
+					// It could be exhausted by previous iterations
+					// ignoring bytes higher than $rand_max.
+					if ($byte_index === $pool_length)
+					{
+						// No failures should be possible if the
+						// first get_random_bytes() call didn't
+						// return FALSE, but still ...
+						for ($i = 0; $i < 5; $i++)
+						{
+							if (($bytes = $security->get_random_bytes($pool_length)) === FALSE)
+							{
+								continue;
+							}
+
+							$byte_index = 0;
+							break;
+						}
+
+						if ($bytes === FALSE)
+						{
+							// Sadly, this means fallback to mt_rand()
+							$word = '';
+							break;
+						}
+					}
+
 					list(, $rand_index) = unpack('C', $bytes[$byte_index++]);
 					if ($rand_index > $rand_max)
 					{
-						// Was this the last byte we have?
-						// If so, try to fetch more.
-						if ($byte_index === $pool_length)
-						{
-							// No failures should be possible if
-							// the first get_random_bytes() call
-							// didn't return FALSE, but still ...
-							for ($i = 0; $i < 5; $i++)
-							{
-								if (($bytes = $security->get_random_bytes($pool_length)) === FALSE)
-								{
-									continue;
-								}
-
-								$byte_index = 0;
-								break;
-							}
-
-							if ($bytes === FALSE)
-							{
-								// Sadly, this means fallback to mt_rand()
-								$word = '';
-								break;
-							}
-						}
-
 						continue;
 					}
 
diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index 04778b084..3e1039525 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -791,7 +791,7 @@ if ( ! function_exists('set_checkbox'))
 		// Unchecked checkbox and radio inputs are not even submitted by browsers ...
 		if ($CI->input->method() === 'post')
 		{
-			return ($input === 'value') ? ' checked="checked"' : '';
+			return ($input === $value) ? ' checked="checked"' : '';
 		}
 
 		return ($default === TRUE) ? ' checked="checked"' : '';
@@ -843,7 +843,7 @@ if ( ! function_exists('set_radio'))
 		// Unchecked checkbox and radio inputs are not even submitted by browsers ...
 		if ($CI->input->method() === 'post')
 		{
-			return ($input === 'value') ? ' checked="checked"' : '';
+			return ($input === $value) ? ' checked="checked"' : '';
 		}
 
 		return ($default === TRUE) ? ' checked="checked"' : '';
diff --git a/system/helpers/inflector_helper.php b/system/helpers/inflector_helper.php
index 96b723c8d..c064d8de4 100644
--- a/system/helpers/inflector_helper.php
+++ b/system/helpers/inflector_helper.php
@@ -219,7 +219,7 @@ if ( ! function_exists('humanize'))
 	 */
 	function humanize($str, $separator = '_')
 	{
-		return ucwords(preg_replace('/['.$separator.']+/', ' ', trim(MB_ENABLED ? mb_strtolower($str) : strtolower($str))));
+		return ucwords(preg_replace('/['.preg_quote($separator).']+/', ' ', trim(MB_ENABLED ? mb_strtolower($str) : strtolower($str))));
 	}
 }
 
diff --git a/system/helpers/text_helper.php b/system/helpers/text_helper.php
index 1fdbedda5..4f9210f2d 100644
--- a/system/helpers/text_helper.php
+++ b/system/helpers/text_helper.php
@@ -275,13 +275,28 @@ if ( ! function_exists('word_censor'))
 
 		foreach ($censored as $badword)
 		{
+			$badword = str_replace('\*', '\w*?', preg_quote($badword, '/'));
 			if ($replacement !== '')
 			{
-				$str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/i", "\\1{$replacement}\\3", $str);
+				$str = preg_replace(
+					"/({$delim})(".$badword.")({$delim})/i",
+					"\\1{$replacement}\\3",
+					$str
+				);
 			}
-			else
+			elseif (preg_match_all("/{$delim}(".$badword."){$delim}/i", $str, $matches, PREG_PATTERN_ORDER | PREG_OFFSET_CAPTURE))
 			{
-				$str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/ie", "'\\1'.str_repeat('#', strlen('\\2')).'\\3'", $str);
+				$matches = $matches[1];
+				for ($i = count($matches) - 1; $i >= 0; $i--)
+				{
+					$length = strlen($matches[$i][0]);
+					$str = substr_replace(
+						$str,
+						str_repeat('#', $length),
+						$matches[$i][1],
+						$length
+					);
+				}
 			}
 		}
 
diff --git a/system/libraries/Cache/drivers/Cache_apc.php b/system/libraries/Cache/drivers/Cache_apc.php
index dd18e7bc8..07ea8f474 100644
--- a/system/libraries/Cache/drivers/Cache_apc.php
+++ b/system/libraries/Cache/drivers/Cache_apc.php
@@ -48,6 +48,24 @@ defined('BASEPATH') OR exit('No direct script access allowed');
  */
 class CI_Cache_apc extends CI_Driver {
 
+	/**
+	 * Class constructor
+	 *
+	 * Only present so that an error message is logged
+	 * if APC is not available.
+	 *
+	 * @return	void
+	 */
+	public function __construct()
+	{
+		if ( ! $this->is_supported())
+		{
+			log_message('error', 'Cache: Failed to initialize APC; extension not loaded/enabled?');
+		}
+	}
+
+	// ------------------------------------------------------------------------
+
 	/**
 	 * Get
 	 *
@@ -198,13 +216,6 @@ class CI_Cache_apc extends CI_Driver {
 	 */
 	public function is_supported()
 	{
-		if ( ! extension_loaded('apc') OR ! ini_get('apc.enabled'))
-		{
-			log_message('debug', 'The APC PHP extension must be loaded to use APC Cache.');
-			return FALSE;
-		}
-
-		return TRUE;
+		return (extension_loaded('apc') && ini_get('apc.enabled'));
 	}
-
 }
diff --git a/system/libraries/Cache/drivers/Cache_memcached.php b/system/libraries/Cache/drivers/Cache_memcached.php
index c44958b97..7e67fc40f 100644
--- a/system/libraries/Cache/drivers/Cache_memcached.php
+++ b/system/libraries/Cache/drivers/Cache_memcached.php
@@ -107,6 +107,7 @@ class CI_Cache_memcached extends CI_Driver {
 		else
 		{
 			log_message('error', 'Cache: Failed to create Memcache(d) object; extension not loaded?');
+			return;
 		}
 
 		foreach ($this->_memcache_conf as $cache_server)
diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
index 81b49e2fc..e9194a499 100644
--- a/system/libraries/Cache/drivers/Cache_redis.php
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -91,6 +91,12 @@ class CI_Cache_redis extends CI_Driver
 	 */
 	public function __construct()
 	{
+		if ( ! $this->is_supported())
+		{
+			log_message('error', 'Cache: Failed to create Redis object; extension not loaded?');
+			return;
+		}
+
 		$config = array();
 		$CI =& get_instance();
 
diff --git a/system/libraries/Cache/drivers/Cache_wincache.php b/system/libraries/Cache/drivers/Cache_wincache.php
index f66080514..d6a0d4fb6 100644
--- a/system/libraries/Cache/drivers/Cache_wincache.php
+++ b/system/libraries/Cache/drivers/Cache_wincache.php
@@ -51,6 +51,24 @@ defined('BASEPATH') OR exit('No direct script access allowed');
  */
 class CI_Cache_wincache extends CI_Driver {
 
+	/**
+	 * Class constructor
+	 *
+	 * Only present so that an error message is logged
+	 * if APC is not available.
+	 *
+	 * @return	void
+	 */
+	public function __construct()
+	{
+		if ( ! $this->is_supported())
+		{
+			log_message('error', 'Cache: Failed to initialize Wincache; extension not loaded/enabled?');
+		}
+	}
+
+	// ------------------------------------------------------------------------
+
 	/**
 	 * Get
 	 *
@@ -194,13 +212,6 @@ class CI_Cache_wincache extends CI_Driver {
 	 */
 	public function is_supported()
 	{
-		if ( ! extension_loaded('wincache') OR ! ini_get('wincache.ucenabled'))
-		{
-			log_message('debug', 'The Wincache PHP extension must be loaded to use Wincache Cache.');
-			return FALSE;
-		}
-
-		return TRUE;
+		return (extension_loaded('wincache') && ini_get('wincache.ucenabled'));
 	}
-
 }
diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 8f3bc989d..8b08aacc7 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -574,14 +574,18 @@ class CI_Email {
 			$this->validate_email($this->_str_to_array($replyto));
 		}
 
-		if ($name === '')
+		if ($name !== '')
 		{
-			$name = $replyto;
-		}
-
-		if (strpos($name, '"') !== 0)
-		{
-			$name = '"'.$name.'"';
+			// only use Q encoding if there are characters that would require it
+			if ( ! preg_match('/[\200-\377]/', $name))
+			{
+				// add slashes for non-printing characters, slashes, and double quotes, and surround it in double quotes
+				$name = '"'.addcslashes($name, "\0..\37\177'\"\\").'"';
+			}
+			else
+			{
+				$name = $this->_prep_q_encoding($name);
+			}
 		}
 
 		$this->set_header('Reply-To', $name.' <'.$replyto.'>');
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 31632762d..296ddb92a 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -637,21 +637,7 @@ class CI_Form_validation {
 				// Set the message type
 				$type = in_array('required', $rules) ? 'required' : 'isset';
 
-				// Check if a custom message is defined
-				if (isset($this->_field_data[$row['field']]['errors'][$type]))
-				{
-					$line = $this->_field_data[$row['field']]['errors'][$type];
-				}
-				elseif (isset($this->_error_messages[$type]))
-				{
-					$line = $this->_error_messages[$type];
-				}
-				elseif (FALSE === ($line = $this->CI->lang->line('form_validation_'.$type))
-					// DEPRECATED support for non-prefixed keys
-					&& FALSE === ($line = $this->CI->lang->line($type, FALSE)))
-				{
-					$line = 'The field was not set';
-				}
+				$line = $this->_get_error_message($type, $row['field']);
 
 				// Build the error message
 				$message = $this->_build_error_msg($line, $this->_translate_fieldname($row['label']));
@@ -820,23 +806,9 @@ class CI_Form_validation {
 				{
 					$line = $this->CI->lang->line('form_validation_error_message_not_set').'(Anonymous function)';
 				}
-				// Check if a custom message is defined
-				elseif (isset($this->_field_data[$row['field']]['errors'][$rule]))
-				{
-					$line = $this->_field_data[$row['field']]['errors'][$rule];
-				}
-				elseif ( ! isset($this->_error_messages[$rule]))
-				{
-					if (FALSE === ($line = $this->CI->lang->line('form_validation_'.$rule))
-						// DEPRECATED support for non-prefixed keys
-						&& FALSE === ($line = $this->CI->lang->line($rule, FALSE)))
-					{
-						$line = $this->CI->lang->line('form_validation_error_message_not_set').'('.$rule.')';
-					}
-				}
 				else
 				{
-					$line = $this->_error_messages[$rule];
+					$line = $this->_get_error_message($rule, $row['field']);
 				}
 
 				// Is the parameter we are inserting into the error message the name
@@ -864,6 +836,40 @@ class CI_Form_validation {
 
 	// --------------------------------------------------------------------
 
+	/**
+	 * Get the error message for the rule
+	 *
+	 * @param 	string $rule 	The rule name
+	 * @param 	string $field	The field name
+	 * @return 	string
+	 */
+	protected function _get_error_message($rule, $field)
+	{
+		// check if a custom message is defined through validation config row.
+		if (isset($this->_field_data[$field]['errors'][$rule]))
+		{
+			return $this->_field_data[$field]['errors'][$rule];
+		}
+		// check if a custom message has been set using the set_message() function
+		elseif (isset($this->_error_messages[$rule]))
+		{
+			return $this->_error_messages[$rule];
+		}
+		elseif (FALSE !== ($line = $this->CI->lang->line('form_validation_'.$rule)))
+		{
+			return $line;
+		}
+		// DEPRECATED support for non-prefixed keys, lang file again
+		elseif (FALSE !== ($line = $this->CI->lang->line($rule, FALSE)))
+		{
+			return $line;
+		}
+
+		return $this->CI->lang->line('form_validation_error_message_not_set').'('.$rule.')';
+	}
+
+	// --------------------------------------------------------------------
+
 	/**
 	 * Translate a field name
 	 *
@@ -1214,6 +1220,14 @@ class CI_Form_validation {
 			$str = $matches[2];
 		}
 
+		// PHP 7 accepts IPv6 addresses within square brackets as hostnames,
+		// but it appears that the PR that came in with https://bugs.php.net/bug.php?id=68039
+		// was never merged into a PHP 5 branch ... https://3v4l.org/8PsSN
+		if (preg_match('/^\[([^\]]+)\]/', $str, $matches) && ! is_php('7') && filter_var($matches[1], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== FALSE)
+		{
+			$str = 'ipv6.host'.substr($str, strlen($matches[1]) + 2);
+		}
+
 		$str = 'http://'.$str;
 
 		// There's a bug affecting PHP 5.2.13, 5.3.2 that considers the
diff --git a/system/libraries/Pagination.php b/system/libraries/Pagination.php
index 9a0db9664..44f848fe0 100644
--- a/system/libraries/Pagination.php
+++ b/system/libraries/Pagination.php
@@ -497,7 +497,7 @@ class CI_Pagination {
 		{
 			$this->cur_page = $this->CI->input->get($this->query_string_segment);
 		}
-		else if (!$this->cur_page)
+		elseif (empty($this->cur_page))
 		{
 			// Default to the last segment number if one hasn't been defined.
 			if ($this->uri_segment === 0)
@@ -512,16 +512,18 @@ class CI_Pagination {
 			{
 				$this->cur_page = str_replace(array($this->prefix, $this->suffix), '', $this->cur_page);
 			}
-        } else {
-            $this->cur_page = (string) $this->cur_page;
-        }
+		}
+		else
+		{
+			$this->cur_page = (string) $this->cur_page;
+		}
 
 		// If something isn't quite right, back to the default base page.
 		if ( ! ctype_digit($this->cur_page) OR ($this->use_page_numbers && (int) $this->cur_page === 0))
 		{
 			$this->cur_page = $base_page;
 		}
-		elseif (empty($this->cur_page))
+		else
 		{
 			// Make sure we're using integers for comparisons later.
 			$this->cur_page = (int) $this->cur_page;
diff --git a/system/libraries/Profiler.php b/system/libraries/Profiler.php
index cc7641436..cf455d3da 100644
--- a/system/libraries/Profiler.php
+++ b/system/libraries/Profiler.php
@@ -314,12 +314,14 @@ class CI_Profiler {
 
 			foreach ($_GET as $key => $val)
 			{
-				is_int($key) OR $key = "'".$key."'";
+				is_int($key) OR $key = "'".htmlspecialchars($key, ENT_QUOTES, config_item('charset'))."'";
+				$val = (is_array($val) OR is_object($val))
+					? '<pre>'.htmlspecialchars(print_r($val, TRUE), ENT_QUOTES, config_item('charset'))
+					: htmlspecialchars($val, ENT_QUOTES, config_item('charset'));
 
 				$output .= '<tr><td style="width:50%;color:#000;background-color:#ddd;padding:5px;">&#36;_GET['
 					.$key.']&nbsp;&nbsp; </td><td style="width:50%;padding:5px;color:#cd6e00;font-weight:normal;background-color:#ddd;">'
-					.((is_array($val) OR is_object($val)) ? '<pre>'.htmlspecialchars(stripslashes(print_r($val, TRUE))).'</pre>' : htmlspecialchars(stripslashes($val)))
-					."</td></tr>\n";
+					.$val."</td></tr>\n";
 			}
 
 			$output .= "</table>\n";
@@ -352,36 +354,26 @@ class CI_Profiler {
 
 			foreach ($_POST as $key => $val)
 			{
-				is_int($key) OR $key = "'".$key."'";
+				is_int($key) OR $key = "'".htmlspecialchars($key, ENT_QUOTES, config_item('charset'))."'";
+				$val = (is_array($val) OR is_object($val))
+					? '<pre>'.htmlspecialchars(print_r($val, TRUE), ENT_QUOTES, config_item('charset'))
+					: htmlspecialchars($val, ENT_QUOTES, config_item('charset'));
 
 				$output .= '<tr><td style="width:50%;padding:5px;color:#000;background-color:#ddd;">&#36;_POST['
-					.$key.']&nbsp;&nbsp; </td><td style="width:50%;padding:5px;color:#009900;font-weight:normal;background-color:#ddd;">';
-
-				if (is_array($val) OR is_object($val))
-				{
-					$output .= '<pre>'.htmlspecialchars(stripslashes(print_r($val, TRUE))).'</pre>';
-				}
-				else
-				{
-					$output .= htmlspecialchars(stripslashes($val));
-				}
-
-				$output .= "</td></tr>\n";
+					.$key.']&nbsp;&nbsp; </td><td style="width:50%;padding:5px;color:#009900;font-weight:normal;background-color:#ddd;">'
+					.$val."</td></tr>\n";
 			}
 
 			foreach ($_FILES as $key => $val)
 			{
-				is_int($key) OR $key = "'".$key."'";
+				is_int($key) OR $key = "'".htmlspecialchars($key, ENT_QUOTES, config_item('charset'))."'";
+				$val = (is_array($val) OR is_object($val))
+					? '<pre>'.htmlspecialchars(print_r($val, TRUE), ENT_QUOTES, config_item('charset'))
+					: htmlspecialchars($val, ENT_QUOTES, config_item('charset'));
 
 				$output .= '<tr><td style="width:50%;padding:5px;color:#000;background-color:#ddd;">&#36;_FILES['
-					.$key.']&nbsp;&nbsp; </td><td style="width:50%;padding:5px;color:#009900;font-weight:normal;background-color:#ddd;">';
-
-				if (is_array($val) OR is_object($val))
-				{
-					$output .= '<pre>'.htmlspecialchars(stripslashes(print_r($val, TRUE))).'</pre>';
-				}
-
-				$output .= "</td></tr>\n";
+					.$key.']&nbsp;&nbsp; </td><td style="width:50%;padding:5px;color:#009900;font-weight:normal;background-color:#ddd;">'
+					.$val."</td></tr>\n";
 			}
 
 			$output .= "</table>\n";
@@ -465,7 +457,7 @@ class CI_Profiler {
 
 		foreach (array('HTTP_ACCEPT', 'HTTP_USER_AGENT', 'HTTP_CONNECTION', 'SERVER_PORT', 'SERVER_NAME', 'REMOTE_ADDR', 'SERVER_SOFTWARE', 'HTTP_ACCEPT_LANGUAGE', 'SCRIPT_NAME', 'REQUEST_METHOD',' HTTP_HOST', 'REMOTE_HOST', 'CONTENT_TYPE', 'SERVER_PROTOCOL', 'QUERY_STRING', 'HTTP_ACCEPT_ENCODING', 'HTTP_X_FORWARDED_FOR', 'HTTP_DNT') as $header)
 		{
-			$val = isset($_SERVER[$header]) ? $_SERVER[$header] : '';
+			$val = isset($_SERVER[$header]) ? htmlspecialchars($_SERVER[$header], ENT_QUOTES, config_item('charset')) : '';
 			$output .= '<tr><td style="vertical-align:top;width:50%;padding:5px;color:#900;background-color:#ddd;">'
 				.$header.'&nbsp;&nbsp;</td><td style="width:50%;padding:5px;color:#000;background-color:#ddd;">'.$val."</td></tr>\n";
 		}
diff --git a/system/libraries/Session/Session.php b/system/libraries/Session/Session.php
index b93c00c15..77c56ae70 100644
--- a/system/libraries/Session/Session.php
+++ b/system/libraries/Session/Session.php
@@ -231,7 +231,7 @@ class CI_Session {
 			}
 		}
 
-		if ( ! class_exists($prefix.$class) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
+		if ( ! class_exists($prefix.$class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
 		{
 			require_once($file_path);
 			if (class_exists($prefix.$class, FALSE))
diff --git a/system/libraries/Session/Session_driver.php b/system/libraries/Session/Session_driver.php
index 98fc897e3..55ddb25e0 100644
--- a/system/libraries/Session/Session_driver.php
+++ b/system/libraries/Session/Session_driver.php
@@ -168,4 +168,24 @@ abstract class CI_Session_driver implements SessionHandlerInterface {
 		return TRUE;
 	}
 
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Fail
+	 *
+	 * Drivers other than the 'files' one don't (need to) use the
+	 * session.save_path INI setting, but that leads to confusing
+	 * error messages emitted by PHP when open() or write() fail,
+	 * as the message contains session.save_path ...
+	 * To work around the problem, the drivers will call this method
+	 * so that the INI is set just in time for the error message to
+	 * be properly generated.
+	 *
+	 * @return	mixed
+	 */
+	protected function _fail()
+	{
+		ini_set('session.save_path', config_item('sess_save_path'));
+		return $this->_failure;
+	}
 }
diff --git a/system/libraries/Session/drivers/Session_database_driver.php b/system/libraries/Session/drivers/Session_database_driver.php
index 3ba9d3d36..317bd7d4d 100644
--- a/system/libraries/Session/drivers/Session_database_driver.php
+++ b/system/libraries/Session/drivers/Session_database_driver.php
@@ -127,7 +127,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 	{
 		if (empty($this->_db->conn_id) && ! $this->_db->db_connect())
 		{
-			return $this->_failure;
+			return $this->_fail();
 		}
 
 		return $this->_success;
@@ -163,7 +163,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 				$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
 			}
 
-			if (($result = $this->_db->get()->row()) === NULL)
+			if ( ! ($result = $this->_db->get()) OR ($result = $result->row()) === NULL)
 			{
 				// PHP7 will reuse the same SessionHandler object after
 				// ID regeneration, so we need to explicitly set this to
@@ -210,7 +210,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 		{
 			if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
 			{
-				return $this->_failure;
+				return $this->_fail();
 			}
 
 			$this->_row_exists = FALSE;
@@ -218,7 +218,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 		}
 		elseif ($this->_lock === FALSE)
 		{
-			return $this->_failure;
+			return $this->_fail();
 		}
 
 		if ($this->_row_exists === FALSE)
@@ -237,7 +237,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 				return $this->_success;
 			}
 
-			return $this->_failure;
+			return $this->_fail();
 		}
 
 		$this->_db->where('id', $session_id);
@@ -260,7 +260,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 			return $this->_success;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -275,7 +275,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 	public function close()
 	{
 		return ($this->_lock && ! $this->_release_lock())
-			? $this->_failure
+			? $this->_fail()
 			: $this->_success;
 	}
 
@@ -304,7 +304,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 
 			if ( ! $this->_db->delete($this->_config['save_path']))
 			{
-				return $this->_failure;
+				return $this->_fail();
 			}
 		}
 
@@ -314,7 +314,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 			return $this->_success;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -334,7 +334,7 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 
 		return ($this->_db->delete($this->_config['save_path'], 'timestamp < '.(time() - $maxlifetime)))
 			? $this->_success
-			: $this->_failure;
+			: $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -414,5 +414,4 @@ class CI_Session_database_driver extends CI_Session_driver implements SessionHan
 
 		return parent::_release_lock();
 	}
-
 }
\ No newline at end of file
diff --git a/system/libraries/Session/drivers/Session_memcached_driver.php b/system/libraries/Session/drivers/Session_memcached_driver.php
index d017dfb2f..88eb4b3a6 100644
--- a/system/libraries/Session/drivers/Session_memcached_driver.php
+++ b/system/libraries/Session/drivers/Session_memcached_driver.php
@@ -117,7 +117,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 		{
 			$this->_memcached = NULL;
 			log_message('error', 'Session: Invalid Memcached save path format: '.$this->_config['save_path']);
-			return $this->_failure;
+			return $this->_fail();
 		}
 
 		foreach ($matches as $match)
@@ -142,7 +142,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 		if (empty($server_list))
 		{
 			log_message('error', 'Session: Memcached server pool is empty.');
-			return $this->_failure;
+			return $this->_fail();
 		}
 
 		return $this->_success;
@@ -170,7 +170,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			return $session_data;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -188,14 +188,14 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 	{
 		if ( ! isset($this->_memcached))
 		{
-			return $this->_failure;
+			return $this->_fail();
 		}
 		// Was the ID regenerated?
 		elseif ($session_id !== $this->_session_id)
 		{
 			if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
 			{
-				return $this->_failure;
+				return $this->_fail();
 			}
 
 			$this->_fingerprint = md5('');
@@ -204,24 +204,33 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 
 		if (isset($this->_lock_key))
 		{
+			$key = $this->_key_prefix.$session_id;
+
 			$this->_memcached->replace($this->_lock_key, time(), 300);
 			if ($this->_fingerprint !== ($fingerprint = md5($session_data)))
 			{
-				if ($this->_memcached->set($this->_key_prefix.$session_id, $session_data, $this->_config['expiration']))
+				if (
+					$this->_memcached->replace($key, $session_data, $this->_config['expiration'])
+					OR ($this->_memcached->getResultCode() === Memcached::RES_NOTFOUND && $this->_memcached->set($key, $session_data, $this->_config['expiration']))
+				)
 				{
 					$this->_fingerprint = $fingerprint;
 					return $this->_success;
 				}
 
-				return $this->_failure;
+				return $this->_fail();
 			}
 
-			return $this->_memcached->touch($this->_key_prefix.$session_id, $this->_config['expiration'])
-				? $this->_success
-				: $this->_failure;
+			if (
+				$this->_memcached->touch($key, $this->_config['expiration'])
+				OR ($this->_memcached->getResultCode() === Memcached::RES_NOTFOUND && $this->_memcached->set($key, $session_data, $this->_config['expiration']))
+			)
+			{
+				return $this->_success;
+			}
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -237,17 +246,17 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 	{
 		if (isset($this->_memcached))
 		{
-			isset($this->_lock_key) && $this->_memcached->delete($this->_lock_key);
+			$this->_release_lock();
 			if ( ! $this->_memcached->quit())
 			{
-				return $this->_failure;
+				return $this->_fail();
 			}
 
 			$this->_memcached = NULL;
 			return $this->_success;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -269,7 +278,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			return $this->_success;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -305,9 +314,12 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 		// correct session ID.
 		if ($this->_lock_key === $this->_key_prefix.$session_id.':lock')
 		{
-			return ($this->_memcached->replace($this->_lock_key, time(), 300))
-				? $this->_success
-				: $this->_failure;
+			if ( ! $this->_memcached->replace($this->_lock_key, time(), 300))
+			{
+				return ($this->_memcached->getResultCode() === Memcached::RES_NOTFOUND)
+					? $this->_memcached->set($this->_lock_key, time(), 300)
+					: FALSE;
+			}
 		}
 
 		// 30 attempts to obtain a lock, in case another request already has it
@@ -324,7 +336,7 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 			if ( ! $this->_memcached->set($lock_key, time(), 300))
 			{
 				log_message('error', 'Session: Error while trying to obtain lock for '.$this->_key_prefix.$session_id);
-				return $this->_failure;
+				return FALSE;
 			}
 
 			$this->_lock_key = $lock_key;
@@ -335,11 +347,11 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 		if ($attempt === 30)
 		{
 			log_message('error', 'Session: Unable to obtain lock for '.$this->_key_prefix.$session_id.' after 30 attempts, aborting.');
-			return $this->_failure;
+			return FALSE;
 		}
 
 		$this->_lock = TRUE;
-		return $this->_success;
+		return TRUE;
 	}
 
 	// ------------------------------------------------------------------------
@@ -367,5 +379,4 @@ class CI_Session_memcached_driver extends CI_Session_driver implements SessionHa
 
 		return TRUE;
 	}
-
-}
+}
\ No newline at end of file
diff --git a/system/libraries/Session/drivers/Session_redis_driver.php b/system/libraries/Session/drivers/Session_redis_driver.php
index 46b8fa1c2..e4e09fe0d 100644
--- a/system/libraries/Session/drivers/Session_redis_driver.php
+++ b/system/libraries/Session/drivers/Session_redis_driver.php
@@ -69,6 +69,13 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 	 */
 	protected $_lock_key;
 
+	/**
+	 * Key exists flag
+	 *
+	 * @var bool
+	 */
+	protected $_key_exists = FALSE;
+
 	// ------------------------------------------------------------------------
 
 	/**
@@ -124,7 +131,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 	{
 		if (empty($this->_config['save_path']))
 		{
-			return $this->_failure;
+			return $this->_fail();
 		}
 
 		$redis = new Redis();
@@ -146,7 +153,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 			return $this->_success;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -166,12 +173,17 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 			// Needed by write() to detect session_regenerate_id() calls
 			$this->_session_id = $session_id;
 
-			$session_data = (string) $this->_redis->get($this->_key_prefix.$session_id);
+			$session_data = $this->_redis->get($this->_key_prefix.$session_id);
+
+			is_string($session_data)
+				? $this->_key_exists = TRUE
+				: $session_data = '';
+
 			$this->_fingerprint = md5($session_data);
 			return $session_data;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -189,40 +201,41 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 	{
 		if ( ! isset($this->_redis))
 		{
-			return $this->_failure;
+			return $this->_fail();
 		}
 		// Was the ID regenerated?
 		elseif ($session_id !== $this->_session_id)
 		{
 			if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
 			{
-				return $this->_failure;
+				return $this->_fail();
 			}
 
-			$this->_fingerprint = md5('');
+			$this->_key_exists = FALSE;
 			$this->_session_id = $session_id;
 		}
 
 		if (isset($this->_lock_key))
 		{
 			$this->_redis->setTimeout($this->_lock_key, 300);
-			if ($this->_fingerprint !== ($fingerprint = md5($session_data)))
+			if ($this->_fingerprint !== ($fingerprint = md5($session_data)) OR $this->_key_exists === FALSE)
 			{
 				if ($this->_redis->set($this->_key_prefix.$session_id, $session_data, $this->_config['expiration']))
 				{
 					$this->_fingerprint = $fingerprint;
+					$this->_key_exists = TRUE;
 					return $this->_success;
 				}
 
-				return $this->_failure;
+				return $this->_fail();
 			}
 
 			return ($this->_redis->setTimeout($this->_key_prefix.$session_id, $this->_config['expiration']))
 				? $this->_success
-				: $this->_failure;
+				: $this->_fail();
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
@@ -241,10 +254,10 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 			try {
 				if ($this->_redis->ping() === '+PONG')
 				{
-					isset($this->_lock_key) && $this->_redis->delete($this->_lock_key);
+					$this->_release_lock();
 					if ($this->_redis->close() === $this->_failure)
 					{
-						return $this->_failure;
+						return $this->_fail();
 					}
 				}
 			}
@@ -283,7 +296,7 @@ class CI_Session_redis_driver extends CI_Session_driver implements SessionHandle
 			return $this->_success;
 		}
 
-		return $this->_failure;
+		return $this->_fail();
 	}
 
 	// ------------------------------------------------------------------------
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index 15caebebe..f2418378b 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -526,6 +526,12 @@ class CI_Upload {
 			$this->file_name = preg_replace('/\s+/', '_', $this->file_name);
 		}
 
+		if ($this->file_ext_tolower && ($ext_length = strlen($this->file_ext)))
+		{
+			// file_ext was previously lower-cased by a get_extension() call
+			$this->file_name = substr($this->file_name, 0, -$ext_length).$this->file_ext;
+		}
+
 		/*
 		 * Validate the file name
 		 * This function appends an number onto the end of
diff --git a/templates/spacelab/views/partial/header.php b/templates/spacelab/views/partial/header.php
index 906dd6f0c..b905e5175 100644
--- a/templates/spacelab/views/partial/header.php
+++ b/templates/spacelab/views/partial/header.php
@@ -65,11 +65,11 @@
 		<![endif]-->
 		<link rel="stylesheet" type="text/css" href="templates/spacelab/css/bootstrap.min.css?rel=9ed20b1ee8"/>
 		<!-- start mincss template tags -->
-		<link rel="stylesheet" type="text/css" href="dist/opensourcepos.min.css?rel=3ded88f8ce"/>
+		<link rel="stylesheet" type="text/css" href="dist/opensourcepos.min.css?rel=60674239d1"/>
 		<!-- end mincss template tags -->
 		<link rel="stylesheet" type="text/css" href="templates/spacelab/css/style.css"/>
 		<!-- start minjs template tags -->
-		<script type="text/javascript" src="dist/opensourcepos.min.js?rel=52d78ada05" language="javascript"></script>
+		<script type="text/javascript" src="dist/opensourcepos.min.js?rel=10400d243b" language="javascript"></script>
 		<!-- end minjs template tags -->
 	<?php endif; ?>