After a possibley malicious attempt to hack the site or a design flaw, ARP's mood code has been causing problems for moderators and administrators. With this code in neither moderators or administrators could see the "Logged in as:" bar that held the link to the admin and moderator CP.
This is what it looked like with the code installed:

I have removed the code from any further site damaged, after the code was removed the problem returned to normal and I can now log out. ^_^