The 'New Posts' button does not seem to working right for me, lately (last few days to the last week, maybe). Forum icons on the front page indicate there are new posts, but the 'New Posts' button shows nothing (or one or two, but not all of them). Which would be less weird if I hadn't made a point of checking everything when I was last in.
[*]'Mark forums read'
[*]logging out/deleting board cookies, then logging back in.
I'll add a reply Monday evening with findings.