In the evening, usually between 11 and 12 (PST), the chat will rarely allow people to log in. If you're already there, it lets you stay, but if you try to log on, you get the black screen. I do not know if it has to do with bandwidth throttling or what, but at exactly midnight, everyone pours into the room again. Usually, I don't get caught, but tonight I obviously tried to log on too late for the "allowable" window!