Index: cat_tag_processor.php
===================================================================
--- cat_tag_processor.php	(revision 13936)
+++ cat_tag_processor.php	(working copy)
@@ -345,7 +345,7 @@
 			$object =& $this->getObject($params);
 			/* @var $object kDBItem */
 
-			$cache_key = 'product_additional_images[%PIDSerial:' . $object->GetID() . '%]';
+			$cache_key = $object->Prefix . '_additional_images[%' . $this->Application->incrementCacheSerial($object->Prefix, $object->GetID(), false) . '%]';
 			$ret = $this->Application->getCache($cache_key);
 
 			if ($ret === false) {