I've noticed that the new post icon and new posts don't "refresh" as quickly as before.
It used to be, from my Subscribed Forums list, I could see what forums had new posts. I would go to that forum and see the new posts, as usual, indicated with bold text. I would read the new posts in that forum and return to the Subscribed Forums list. The list would immediately
show that there are no more new posts in that forum.
Now, the forum (that I just read) still shows the new posts icon and when I go into that forum, the posts that I just read are still shown in bold text.
The forum eventually (after a minute or two) refreshes to indicate that I've already read that forum and new posts.
Maybe I shouldn't read as quickly as I do.
I hope this all makes sense.