I'm having the opposite problem with the unread posts indication. Many people have said the red numbers won't go away, but I'm not getting any in the first place. The threads used to be highlighted a darker grey background when there were unread posts as well but this isn't happening either. I'm logged in and I have cookies allowed.
I can see no indication of new posts at all now. Very inconvenient <img src="http://www.catsailor.com/forums/images/graemlins/frown.gif" alt="" />