Penn suggested that I post this to see if I am the only one having this problem.
When I log into the site, the forum shows me all the threads that have new information. Has that little "1 new" or "200 new" (if I've been gone awhile!) listed next to the thread name. There are times when I will start to read them and then have to leave the site - having not read all the new threads. When I come back, all the threads are marked as read - even though I have not read them.
Anyone else had this issue? Or am I just losing my mind!?