Hehe. Good point
Ok here is the situation. When a user comes to a thread that already had new posts on it, no matter where they may be in the thread itself, either in threaded or flat view, this little icon:
newfolder.gif
shows up for all new posts. Which is a good thing. Now, when you click on any of those posts to view them, all other messages that were new are now marked as read, leaving you unable to figure out which thread is new and which one isn't.
This currently happens in both of my installationsof 6.5b4 as well as on this board. When I came here, there were two new posts. I clicked on your new posts, and the other one is now marked as read.
So there you have it. I hope that makes some more sense and sorry I was so vague.