I was going to post a message in the site's main chat room but it's not visible by default in the list of DIY chat rooms. When I click on the Show Frozen/Deleted Rooms button and join the room, I get the message:
This room is frozen; new messages cannot be added.
Is this a glitch on the chat server? Or perhaps an oops by the staff or moderators?
In this case, there doesn't seem to have been a particularly active room to talk about previously. We do try to keep at least one room open per site, but it looks like some 1:1 rooms (question-related rooms between a few users) were taking precedence. I've changed it such that after the next build those 1:1 rooms will be excluded when considering room pruning (when it asks: "is there a more appropriate room to forcibly keep alive for this site?")