The community forums were putting extreme stress on the servers, resulting in many "Resource limit reached" errors, slowness and other problems.
This may have been caused by certain forum exploits, or the amount of daily spam that has accrued.
Unfortunately we were instructed to take them down immediately. We're sorry for any content that has been lost.
However now that the stress of the forums has been mitigated, we'll be able to manage the website much better.