This instance appears to have been closed without notice. Its not an instance I particularly enjoy so I didn't notice until it was brought to my attention. I see no sign of any known exploit. This leads me to think that it may be receiving some kind of revamp. (It would not be the first time a space has been..unexpectedly closed prior to the announcement of a revamp.)
If its a known issue, could we get it added to the known issues list?