I always log out here if I am not on the computer for a long time. Sounds funny, but it is so . Weekdays I turn off the computer even if I am not at home. When I log in again, however, many threads already read on the last day are displayed as unread. Regardless of whether I delete the cookies or not. FF 3.0.1 on the Mac. Until a few days ago this worked without any problems. Greeting, Olli