Looks like I can't see what thread I'm on while I'm on that thread. Seems like that must have gotten broken during the new updates to the UI here.
It looks like the forum hotlinks have disappeared at the top of each thread. For example, if I was viewing the Donald Trump thread, there would be a link at the top that said something like "Current Events -> United States." I could then click on "United States" to navigate back to that forum. This makes navigating much easier, especially if I want to catch up on all the latest posts quickly.