Index: wp-admin/css/global.dev.css
===================================================================
--- wp-admin/css/global.dev.css	(revision 17519)
+++ wp-admin/css/global.dev.css	(working copy)
@@ -199,7 +199,7 @@
 .js .closed .inside,
 .js .hide-if-js,
 .no-js .hide-if-no-js {
-	display: none;
+	display: none !important;
 }
 
 /* include margin and padding in the width calculation of input and textarea */