I don't use the 'new posts' facility, because there are quite a few subforums on TD I don't read or participate in. I tend to go to the forums I like, & click on topics I've been reading, or new ones that interest me. Obviously, I use the 'last unread post' icon, but find if I haven't read the thread for a while (maybe it's just been bumped), instead of the last unread post, it takes me back to the OP - even if I've previously posted in the thread.
What is the statute of limitations on a thread? How long can you leave it without reading it, before you automatically lose your place (ie where you were) in it?