There's a workaround to get into chat atm, but it's not pretty. Refresh your browser window on any page here (hit "reload" and you may have to clear your cache) and then choose "No popup chat."

Then, scroll down until you can see "Enter chat now" (the page is badly formatted atm, for which we apologize). Clicking on that link *should* get you back into the old chat rooms.

DocJohn