Index: wp-includes/admin-bar.php
===================================================================
--- wp-includes/admin-bar.php (revision 22127)
+++ wp-includes/admin-bar.php (working copy)
@@ -174,8 +174,8 @@
$user_info = get_avatar( $user_id, 64 );
$user_info .= "{$current_user->display_name}";
- if ( $current_user->display_name !== $current_user->user_nicename )
- $user_info .= "{$current_user->user_nicename}";
+ if ( $current_user->display_name !== $current_user->user_login )
+ $user_info .= "{$current_user->user_login}";
$wp_admin_bar->add_menu( array(
'parent' => 'user-actions',