Regular comments now being moderated

Hi there.

I’ve searched Google and the forums and have been unable to resolve this problem.

About a dozen regular commenters have started to go into moderation. I haven’t changed any settings and their comments don’t include links. It’s not keyword related as I haven’t entered any key words in the Setting page under Discussions.

I have checked with Akismet and they have not been able to help as comments are not going into Spam, just being moderated.

I am using the Thesis Theme. My blog is ShadesofCrimson.com

Any ideas how I can fix this? I can supply you with the list of those commenters if needed.

Thanks.