Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 26049)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -4222,7 +4222,7 @@
 	margin: 0;
 	list-style: none;
 	position: absolute;
-	z-index: 10000;
+	z-index: 500001;
 	display: none;
 	border-width: 1px;
 	border-style: solid;