Ok. This one's a weird one and not critical. I'm also not sure if it's due to updates or if it was there previously but here's what happened:

When I log on, the first thing I do is go to Discussion Forums --> View New Posts. I then go through the posts to see what's interesting, does anything need to be moved, whatever. I usually hit the back button and refresh so that the post is marked as read by me. What I found weird is that some posts would go from being read to unread -- eventhough I know a) that I've read it and b) no one has replied or bumped it.

Very odd thing. Now I had one and a half pages of posts so I don't know if volume had anything to do with it.