Index: wp-admin/css/colors-classic.dev.css
===================================================================
--- wp-admin/css/colors-classic.dev.css	(revision 18691)
+++ wp-admin/css/colors-classic.dev.css	(working copy)
@@ -1344,7 +1344,8 @@
 #adminmenu li.current a.menu-top,
 .folded #adminmenu li.wp-has-current-submenu,
 .folded #adminmenu li.current.menu-top,
-#adminmenu .wp-menu-arrow,
+#adminmenu .wp-has-current-submenu .wp-menu-arrow,
+#adminmenu .current .wp-menu-arrow,
 #adminmenu .wp-has-current-submenu .wp-submenu .wp-submenu-head {
 	background-color: #5589AA; /* Fallback */
 	background-image: -ms-linear-gradient(bottom, #5589AA, #5A8FAD); /* IE10 */
@@ -1385,12 +1386,12 @@
 	background-color: #fff;
 }
 
-.folded #adminmenu .wp-submenu-wrap,
-.folded #adminmenu .wp-submenu ul {
+#adminmenu .wp-submenu-wrap,
+#adminmenu .wp-submenu ul {
 	border-color: #d0dfe9;
 }
 
-.folded #adminmenu .wp-submenu-wrap {
+#adminmenu .wp-submenu-wrap {
 	-moz-box-shadow: 2px 2px 5px rgba( 0, 0, 0, 0.4 );
 	-webkit-box-shadow: 2px 2px 5px rgba( 0, 0, 0, 0.4 );
 	box-shadow: 2px 2px 5px rgba( 0, 0, 0, 0.4 );