Your video did attach and I was able to download it. It is very small but I was able to watch you interact with the Favorites. (not the Navigator)
There is something indeed going wrong with the creation of new folders as depicted in your video, but I did not see the problem that you stated required restarting PM6 in order to see the updated tree. You expanded the folder that should have been expanded for you (but wasn't) and the new folder appeared.
How does one reproduce the problem where the new folder won't ever appear no matter what you do inside PM6?
Thanks,
-Kirk