I missed this -- because I have the same problem! It's been about 6 months now, and Tom tried to work it out for me and he could never figure it out. There are mornings when I log-in and have not been on since 8pm the night before and there are only 2 unread posts, but I go to a board and there are dozens. No idea why. I have deleted cookies, tried a different browser (Ie/ Firefox vs Chrome) and it happens on my mobile as well. Noooooooo clue --- but do let me know if you figure it out!!!!