Index: t3lib/class.t3lib_tceforms.php
===================================================================
--- t3lib/class.t3lib_tceforms.php	(revision 6752)
+++ t3lib/class.t3lib_tceforms.php	(working copy)
@@ -4006,8 +4006,7 @@
 			$selIconInfo = @getimagesize(PATH_typo3.$icon);
 		} else {
 			$selIconFile = t3lib_iconWorks::skinImg($this->backPath,'gfx/'.$icon,'',1);
-			$iconPath = substr($selIconFile, strlen($this->backPath));
-			$selIconInfo = @getimagesize(PATH_typo3 . $iconPath);
+			$selIconInfo = @getimagesize(t3lib_div::resolveBackPath(PATH_typo3 . $selIconFile));
 		}
 		return array($selIconFile,$selIconInfo);
 	}