In WordPressMU 2.7 there is a new admin bar. It has settings so users can see it on the admin panel side if they are logged in, and a wonky bit to switch between blogs that may have a few bugs.
For any reason if you don’t want it then here’s how to disable it.
Go to wp-config.php and edit it (you will get it in the root of WordPressMU installation).
Find the following lines in wp-config.php
// Uncomment to disable the site admin bar //define( ‘NOADMINBAR’, 1 );
Now, uncomment the second line i.e. remove those // in front of the word “define”?
That’s it. BINGO!
In a freshly installed copy of WPMU 2.7, you’ll find these lines in wp-config.php when WPMU is up and running.
In case of upgraded WPMU 2.7, check the config-sample.php and make sure you copy these lines into your existing wp-config file.