Index: wp-admin/js/common.dev.js
===================================================================
--- wp-admin/js/common.dev.js	(revision 18129)
+++ wp-admin/js/common.dev.js	(working copy)
@@ -74,7 +74,7 @@
 					}
 					m.addClass('sub-open');
 				},
-				out: function(){ $(this).find('.wp-submenu').removeClass('sub-open').css({'marginTop':''}); },
+				out: function(){ $(this).find('.wp-submenu').removeClass('sub-open'); },
 				timeout: 220,
 				sensitivity: 8,
 				interval: 100