Well, it wasn't broken. It was just hided or something. Strange.
It was not simply hidden; it was actually broken. When I tried to access it by directly typing the URL into the address bar, it forced me to login (even though I was already logged in), and when I did, it kicked me to the board index. And when I tried to access it again, the exact same thing happened.
Now ask Xarwin to fix the chat and it's fine.