I use the "New Posts" link at the top of the forum to navigate my way around CU. Normally, when I read a thread and click on "New Posts", that thread shows up as non-bolded, whereas the thread Ihaven't yet read show up as bold (if that makes any sense at all). Also, when I click on the little arrow thing to the left of the thread title, it takes me to the first post I haven't read.

Now, however, when I click on the "go to first new post" arrow, it takes me to the same post as the last time I viewed the thread, and all of the thread titles remain bolded in the "New Posts" view.