While persuing some of the forums, then hitting the 'Mark Forum Read' link on either the top or bottom, I get returned to the main page as normal, but the forum is still marked unread. Going back in, the posts I just read are still marked unread. First notice in 'Tips' forum, but have the same problem in multiple forums.
Also tried hitting the individual mark forum read link on the main page, and the mark all forums read. Marking all DID mark some of the forums, such as Linux and WoT.
Moz 1.0 on W2K
edit: This very post and this forum are exhibiting the behavior.