I'll just say this and then I'll shut up (for now). I can't tell the difference between a post I've already read and one I haven't read. I find that to be very annoying, especially when trying to nest while working. I lose my place.
You see that little rectangle thing with the lines through it to the left of a post? It is bolded when it's a new message or has a new reply. It's faded when it's one you've already read. Yeah, it took me a while to figure that out too. Definitely not as intuitive as the old format.
Re: One thing I don't like