If you hit the Log Out tab top right of page above. It doesnt log you out and leads to a server error page. You can hit the back button and your still logged into the forum. The usual way still works by clicking on your avatar and logging out. This is with Firefox.
Your browser sent a request that this server could not understand.
Yes, I have confirmed this in full desktop mode. @Cindy_FICO can you take a look at this one. Thanks.