Index: branches/5.2.x/core/units/helpers/image_helper.php
===================================================================
diff -u -N -r14244 -r14585
--- branches/5.2.x/core/units/helpers/image_helper.php	(.../image_helper.php)	(revision 14244)
+++ branches/5.2.x/core/units/helpers/image_helper.php	(.../image_helper.php)	(revision 14585)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: image_helper.php 14244 2011-03-16 20:53:41Z alex $
+* @version	$Id: image_helper.php 14585 2011-09-24 12:04:17Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -114,7 +114,8 @@
 
 				if ($needs_resize || array_intersect(array_keys($params), $transform_keys)) {
 					// resize required OR watermarking required -> change resulting image name !
-					$dst_image = preg_replace('/^'.preg_quote($src_path, '/').'(.*)\.(.*)$/', $src_path . DIRECTORY_SEPARATOR . 'resized\\1_' . crc32(serialize($params)) . '.\\2', $src_image);
+					$src_path_escaped = preg_replace('/(\\\[\d]+)/', '\\\\\1', $src_path); // escape replacement patterns, like "\<number>"
+					$dst_image = preg_replace('/^'.preg_quote($src_path, '/').'(.*)\.(.*)$/', $src_path_escaped . DIRECTORY_SEPARATOR . 'resized\\1_' . crc32(serialize($params)) . '.\\2', $src_image);
 
 					$this->fileHelper->CheckFolder( dirname($dst_image) );