For some reason it doesn't mark the forums as read once I read all the posts in them. I can't really figure out why, but it's not much of a problem. Once I know I've read everything I just hit the mark all forums as read button.
I also found the new forums to be overwhelming when I first used them because I had never used a vBulletin forum before. But once I got used to it I realized how much better it is. Right now my favorite function is the subscribe to forums. I love getting emails whenever someone replies to one of my posts.
