Bluto,
i just tried this with VLC on my machine, and sure enough, clicking “Play Film” just kinda hangs. other features play. (50 GB disc only)
I burned to disc ages ago, and the discs work perfectly fine for me on set top players.
If I use the VLC playback menu and select title 21 (the feature) i also just hang VLC.
¯\_(ツ)_/¯