I've noticed lately that if I don't open all of the forums/posts with new messages almost immediately (opening tabs like crazy), that the forum marks everything as read and the links just say "No new posts since your last visit" if I click on the "view new posts" icons next to certain threads.
Today, it happened almost instantaneously, that only the first 3-4 posts I opened showed new posts, and everything else did the "No new posts" thing. Normally I have a good 10 minutes or so before this happens...
I looked through the settings and don't see anything that might control this, is there any way to slow down how fast the forum assumes your "current visit" is your "last visit"?