I'm not really sure why this was disabled in the first place, but it's enabled now. Any new accounts will need to be activated before it's possible to post. Hopefully, this will help to reduce some of the spam attacks we've been getting lately. If it still proves to be a problem, I'm going to make it so all new accounts need to be approved by an admin first.
Also, please remember that you can report spam posts. I do still check this forum regularly, so I will see any reported posts right away.