I am not totally sure of this... but it seems like the previously read posts that show up as unread fall into this pattern: One post from each Forum (like General, Technical, Programing, etc.) and that post will be the last post that was read in that forum in the previous bbs session, and possibly only if that session were in a previous day.

It's much more severe for me. Usually it's a few posts per forum, again the latest ones. Sometimes 20-30 of them go unread at the same time, when this happens I just read the latest in the "Past 24 hours" page and close the session to reset all of them again.

This is really starting to get on my nerves.

Borislav