Index: t3lib/class.t3lib_tceforms.php
===================================================================
--- t3lib/class.t3lib_tceforms.php	(revision 7110)
+++ t3lib/class.t3lib_tceforms.php	(working copy)
@@ -4007,9 +4007,10 @@
 			$selIconFile = $this->backPath.$icon;
 			$selIconInfo = @getimagesize(PATH_typo3.$icon);
 		} else {
-			$selIconFile = t3lib_iconWorks::skinImg($this->backPath,'gfx/'.$icon,'',1);
+			$selIconFile = t3lib_iconWorks::skinImg($this->backPath, 'gfx/' . $icon, '', 1);
 			$iconPath = substr($selIconFile, strlen($this->backPath));
-			$selIconInfo = @getimagesize(PATH_typo3 . $iconPath);
+			$iconRealPath = t3lib_div::resolveBackPath(PATH_typo3 . $iconPath);
+			$selIconInfo = @getimagesize($iconRealPath);
 		}
 		return array($selIconFile,$selIconInfo);
 	}