If I click on "Chat" I get a 404 Error. It's been happening since last night. I can get to individual posts by clicking on notifications. I can go to all the other sub-forums except Chat.
If I'm on an individual thread within Chat (via Notifications or "View New Content") and I click "Go back to Chat" then I get the same error.
I tried turning off my computer, and reloading the browser hoping it was some kind of glitch on my end.