Why would it show under new posts if you've already read that thread? Once you open a thread, it will not appear under new threads until someone else posts in it. Trust me, your mistaken. That is exactly how it worked before.
No it did not I am telling you. That is the only thing I used on the old site or I would go to member classifieds to sell something or list wanted. Other than that alway click on new post. When I got off and came back on I would hit new post and it would only show the new ones for when I was off. If I posted something on a post and click on new post it would be on top or close to it depending how many people posting.