Index: wp-admin/menu-header.php
===================================================================
--- wp-admin/menu-header.php	(revision 15819)
+++ wp-admin/menu-header.php	(working copy)
@@ -13,7 +13,8 @@
  * @name $self
  * @var string
  */
-$self = preg_replace('|^.*/wp-admin/|i', '', $_SERVER['PHP_SELF']);
+$self = preg_replace('|^.*/wp-admin/network/|i', '', $_SERVER['PHP_SELF']);
+$self = preg_replace('|^.*/wp-admin/|i', '', $self);
 $self = preg_replace('|^.*/plugins/|i', '', $self);
 $self = preg_replace('|^.*/mu-plugins/|i', '', $self);