I don't know what happened, but when you mark all threads read, "There have been threads and posts since your last visit" is what is posted at the top (when it should read 0 threads and 0 posts). Correction, it seems to do that fairly often now, regardless of the new thread/post count. If the new version of vBulletin addresses the problem, nothing to worry about, just thought I'd bring it up. This is a recent issue I noticed.