The spammers have found a new way in. Hate to do this, butwe may need to delete a few thousand spam accounts that have registered in the past few months. Problem is, that would likely delete a moderate number of legitimate users, too.
So, if you've joined in the last half-year and have never made any posts, please go to this thread: viewtopic.php?f=1&t=11296
...and make a post, any post. This will show you're a human, and your account won't be deleted. Any recent account that has zero posts in a day or two will be deleted, so please make a post today.
Sorry for the brute-force fix. Hopefully we'll find a more graceful fix before the hammer falls.