My unread posts get (got?) marked as read when I exit / close. I don't know how long this has been like this, I normally read them all when I log on.
But, today there were a significant number when I logged on..... got distracted and logged off. Now when I logged on there is only 10 or so.
This with Netscape 7.01 (sorry) and Windows98SE (sorry for that too)
For what it is worth
Ralph