MyBB Community Forums

I recently just got a new forum (1.8.6) on a new server, and I connected an old database from 1.8.5 upgraded it, got it to work correctly etc. Now the only issue I seem to be having is nobody can log out, but they can login. I tried this on multiple themes, and none of them can logout.

How can I go about fixing this?
http://thegame-zone.com/site20/forum

Can you please provide us with a test account? Your cookie settings seem to be correct, but I would like to take a look at the headers set during the logout process.