Conrad wrote:
- set up a new user group so that newly registered users with <1 post can only post replies in a certain forum

Ha! Tried that. I set up a forum where new registrants could post, and prevented them from seeing any other forum even. I moved non-spammers to the normal category right away, and left the spammers to use the bogus forum. The spam bots started posting away in it. They did not realize that nobody else could see their spam, they just posted away! Repeatedly.

And like the Subject line says, the spam bots have figured out how to get past the captcha text.

I just need to get to work and upgrade. I've been bitten by the php 5.4 blank posts problem (the curly quotes and characters with diacritical marks killing the text), and I really need the Stop Forum Spam feature.