As title implies, Chat is not functioning properly.
General Chat room does not appear, only the user list, which disappears and reappears empty as people sign in and out.
I have signed out and back in with cookies/history cleared, on both IE and Firefox.
No changes occurred other than the chat allowing me to start a new room.
Not sure if this is universally affecting others' ability to use the service, but it is certainly a new problem.