Hi Twisty. In 6.3.2 that wouldn't apply. My question would be do you mean that while your looking at a forum unread posts will all the sudden be marked as read or do you mean that when you come back for another visit posts are marked as read even though you didn't read them on your last visit?
If it's the latter then that is just the way .threads works. New post tracking is session based per forum. So, you go into a forum that has 10 new threads. You read one of them. You close your browser and return to that forum, all 10 threads will be marked as read. It's a limitation of what we can actually track without tracking every post that you've ever read.
If it's not that and it's just all the sudden posts are marked as read while your visiting, then I would guess that something is deleting your w3t_visit cookie during your visit or setting it to blank. This is what is used during your visit to a particular forum. If this is messed with during your visit it will re-grab from the w3t_Last table which would basically make everything be marked as read in that forum.
