This made me laugh...

After logging in, doing the usual browsing and looking over a message, I clicked the log out button. The response?

"Sorry, but you do not have permission to use this feature. If you are not logged in, you may do so using the form below if available."

I will try to log out again and see if I have permission this time...

Don't forget, BWL is like the mafia, you can join but cannot easily get out!

Joking apart, I think you had already been logged off for some reason when you clicked the button (for example, removed cookie).

To keep it BG-related, replace "mafia" with Shadow Thieves and you have it.