That was interesting...
I was doing some back-end work over the last few days, and managed to disable some scripts and functions that I didn't intend to. That resulted in locking myself out of the forum for a day or so.
At any rate, I've rolled the bad upgrades back, and will do some research before I apply them again. If you've become a member over the last few days and and are having problems, contact me at MysteryAdmin @ ravensbeak.com (remove the spaces). Unless you're a spammer.
Edit: It seems rolling back also killed a few posts, but that was pretty much unavoidable. Sorry. I know it killed a reply I had posted to Dave Freas' thread.