BLUF - use Recent Posts (top left, under the donkey).

It seems this is what's going on:

Stan, your last post isn't "new" because you've read it. "New" posts are now only unread ones. Posts get marked as read after a) you write them; OR b) after you open the thread that contains them.

Recent posts are ones that were made recently, read or unread.

Recent goes back 24 hours.

New = unread goes back until read, or 10 days, whichever is earliest.