Ugh, this new behavior is quite bad IMO. Here's why. "New Posts" is the only way to see what's going on across all the PM forums. There are dozens of forums on PM, so it is very impractical to go forum by forum to see " what's going on." Activity stream is sort of that, but it is limited to 75 activities.
The new interpretation of "New Posts" is too literal. 2 scenarios that are now much harder than they were before the change:
1. I reply to a post, then I want to re-read it to see if it makes sense. With the new interpretation, I have to remember which forum it was under, then go to that forum to see it.
2. I want to re-read a thread on something interesting that I now might want to contribute to. I have to know which forum it was in, then go to that forum. Or, hope that someone adds a post to it so it goes back into "New Posts."
I liked the old way better. It was like that for years, and worked well IMO.
Regards.
Mike