Index: /CKEditor/trunk/_source/plugins/format/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/format/plugin.js	(revision 3120)
+++ /CKEditor/trunk/_source/plugins/format/plugin.js	(revision 3121)
@@ -35,5 +35,5 @@
 				panel :
 				{
-					css : [ config.contentsCss, editor.skinPath + 'editor.css' ],
+					css : [ config.contentsCss, CKEDITOR.getUrl( editor.skinPath + 'editor.css' ) ],
 					className : 'cke_skin_default'
 				},