Index: branches/RC/core/units/images/image_tag_processor.php
===================================================================
diff -u -N -r9760 -r10098
--- branches/RC/core/units/images/image_tag_processor.php	(.../image_tag_processor.php)	(revision 9760)
+++ branches/RC/core/units/images/image_tag_processor.php	(.../image_tag_processor.php)	(revision 10098)
@@ -250,7 +250,7 @@
 		}
 
 		// relative url
-		return FULL_PATH.'/'.substr(THEMES_PATH, 1).'/'.$path;
+		return FULL_PATH.'/'.mb_substr(THEMES_PATH, 1).'/'.$path;
 	}
 
 	/**