Index: wp-admin/includes/ms.php
===================================================================
--- wp-admin/includes/ms.php	(revision 18004)
+++ wp-admin/includes/ms.php	(working copy)
@@ -497,7 +497,7 @@
 add_filter( 'get_term', 'sync_category_tag_slugs', 10, 2 );
 
 function _access_denied_splash() {
-	if ( ! is_user_logged_in() )
+	if ( ! is_user_logged_in() || is_network_admin() )
 		return;
 
 	$blogs = get_blogs_of_user( get_current_user_id() );