Our loverly chatroom, as you may have noticed, is not working properly in Firefox and Chrome if you (or your computer) have recently updated your Adobe Flash Player to version 10.1. There was a bugfix which the chat-programmer released, but it's not quite stable yet (as we figured out this afternoon.)
At the moment, the chat is back up and in in 'working' order (aka we're still having problems, but you can still chat without those causing issues in terms of your messages being received and displayed.) As soon as there's a new fix out, we'll try to fix it again.
Happy chatting!