It's actually worse than that -- you don't get to see the actual new threads until you click on "new posts" again. So what I do is go back to the home page and start a new search (it's essentially a dynamically generated set of search results).
If you want to bookmark anything, and keep revisiting the bookmark, I would bookmark do=getnew (note: don't go to the link and bookmark that, it auto-rolls-over to the search results, bookmark that specific URL -- I.E. if you are in FireFox, do right-click->"Bookmark this link").