"Unread" Inconsistencies

This weekend’s website issues have made me aware of an issue with the website. If at this moment I go to “Unread Messages” it says that I have no unread messages. However, if I go to “Forums” I can see that the Gadgeteer forum is marked with the “New” red logo indicating that there are new messages there that I haven’t read. Browsing around I can’t figure out what the post is… If I click “mark all as read” then the “New” icon goes away. Maybe it’s a date range thing? I think it would make sense if these two indicators behaved identically.