I work in a forum as admin. I close the board for maintenance. I go to a userprofile (normal user) and say: become this user.
I see that the board is closed. I cant click logout. I be still logged in and not be able to get the login requester to relog as admin. I have to kill first my cookies.
The fix should be killing the login information if you click the logout link.

Ok, have this fixed for 7.3.2. The logout script didn't completely finish when the board was closed.