It's been documented that hidden posts seem to break page numbering and also cause reply numbers to be different for mods/admins vs. members. Do your issues resemble anything in this bug: Incorrect reply and page counts? If so, and you think you can add any information, certainly feel free to jump into the discussion. From all accounts I've seen, the "jump to first new post" icon works fine when going to the first unread message in a previously read thread. However, some members, myself included, have had issues where clicking on the new post icon next to a previously unread thread sends them to reply #1 rather than the lead. This issue is listed as a separate bug. I filed this one: In completely unread thread, "jump to first new post" icon jumps you to first reply, although I know there's another thread around with more extensive discussion. Yuku staff member Chris W962 and I have PMed a lot about the new post icon in previously unread threads. A fair number of members are experiencing it, and it's a tough one to pin down. It appears to be profile and forum-related. (That's forum-related, not board-related.) That is, I only experience the issue in some forums on Brewerfan. And I only experience it under my 1992casey profile--and not at all under several of the test profiles I played around with.