So for some reason.. starting with my last post, I am unable to reply to any threads.. I just get this:
Your submission has triggered the spam filter and will not be accepted.
How can I reply to messages now? Posting new threads still seems to work. I suppose I could start a new thread titled "Re: Old Thread" every time I want to reply to something.

Just noticed that.. any urls seems to trigger the spamfilters' wrath. Guess most of my posts I've been trying to had links to mantis bugs etc. or websites explaining how to fix problems that I wanted to post to help answer someones questions.. I gave up on that as it never worked.
Seems I can post when I don't use URLs, although having to fill out a Captcha with each and every post and even for previews is HIGHLY irritating :-(