Prior to doing the following I visited every top level forum and clicked "Mark forum read". Then I went to the Daniweb home page. The Menu bar down the right side showed Unread beside all forums. Clicking on any Unread link just made that link disappear. I think, since I had previously marked all forums as read, Unread should not be showing beside any forum name.
Incidentally, refreshing the page restored all of the Unread links.