Did you make some change to the "unread posts" button.
Suddenly, everything I ever didn't [ read -- including things I decided not to read and had marked as "read"-- appears.
I know, I can go to "since last visit," but it's not nearly as easy as the big blue "unread posts" button. I guess, if you feel there is a need for someone to read all
unread posts (even those that were previously not read, but marked "read") you could make that into a small button somewhere. In the meantime, please bring back the familiar feature for the "unread posts" button.