'Private Forums' Bad Request

[Rufus]

Okay, I deleted my previous thread about this bad request because I thought it was fixed but I've narrowed down the problem now. I can minimize the forum categories on the front page fine, but when it comes to the 'Private Forums' at the bottom I get a bad request that prevents me from accessing any page on the forum when I go onto a different page. I'm using the latest version of Firefox. Be warned, you're going to have to clear your cookies if you test this and it messes up for you.

Edit: Wth, now it's working but the same error came up for Crono when he did it

Edit 2: Try minimizing the "Current Active Users" (by pressing ) and then clicking on "Who's Online" because the same error occurs.