Dutchy is most likely correct. Usually if the Chatroom won't hold your login, it's because the cookies set in your internet browser are having some issue (I still don't know what it is, but I know it happens).
So if you know how to delete them specifically, do that; otherwise, delete all your Temporary Internet Files. Then the login issue should go away. Let me know if you need some specific directions. You'll need to let me know what internet browser you're using.