I don’t know if the VLC playlist function can somehow determine some difference between the different Flash Drives and tell when it is not the original physical Flash Drive on which the music files and the playlist were saved and it won’t allow the playlist to work unless it’s the absolute original physical Flash Drive … not just any Flash Drive with the original’s Drive designation.

Or … here’s another possibility. On my original / main Flash Drive, the Videos folder on which the music files and the playlists are saved — it is the genuine official fancy CUSTOM Videos folder created by the PortableApps.com platform. The Videos folder on that backup Flash Drive on which I finished conducting my experiment — it is just a “Videos” folder that I created. Maybe the VLC playlist function can tell a difference between those 2 types of “Videos” folders. I don’t know.