Here's the deal folks:
User log-ins on the forum are being cached and not reset. We are going to be relocating the forum to a location on the server where this will not happen (it will not be subject to the same caching actions). There is no evidence that any accounts have been hacked or otherwise compromised, so let's sit tight and we'll get this settled shortly. It will likely be several hours, but we'll be back up and running later today with information on the forum's new URL and any advice on resetting your bookmarks to the forum.
I'll repost this on all forums, and send out a blast email if I can, and then we'll likely put the forum in maintenance mode while we do this so that no posts get lost.
Sorry for the inconvenience. We'll be back soon.