--- img_assist.module.old	Thu May  7 10:23:41 2009
+++ img_assist.module	Thu May  7 10:24:19 2009
@@ -1452,7 +1452,7 @@
         $size['label']  = t('Custom');
         // Add width and height to make it possible to have multiple custom
         // sizes of the same image.
-        $size['key']    = 'img_assist_custom-' . $width . 'x' . $height;
+        $size['key']    = 'img_assist_custom';
         $size['width']  = $width;
         $size['height'] = $height;
       }