"Invalid Token" Error

Hi guys,

I have noticed for a while now, but have been too lazy to write:p an error that occurs every now and then when trying to log off. If i have gone off and not done anything on the site for a while and then go to Profile> logoff... I get an error page with just "Invalid Token" showing.

Now Ive just gone to Dashboard, and Ive already logged out there.

Any ideas whats happening?

Thanks
Katie