index.php?mark=forums << that link is not available anywhere on the 3myl_castle theme (unless I am blind). The link marks all forums as read. I would imagine the theme designers left it out? Is it in your theme?
Second as a Moderator there are 3 forums that do not mark all topics read when I click on the link. Frankly I don't want to have to dive into 'Hanging Gardens of Babylon' as a Moderator to make their forum light turn off, and I am pretty sure they do not want me to either.
Nothing world shattering just want to mention it. If I had control over the DB I would do a quick repair on all the tables after the next backup. I would gander some indexes got FUBAR digitally and the procedure set of code is not marking them as read on the board.