Ah, good point. I backed up and I will restore from backup a second time. I'll make a playlist that works, add more tracks to it, but then they no longer display on the iDrive. Another issue is a playlist shows/plays the music from another playlist. So something is off and hopefully restoring again will fix it.
2013 Mineral Grey 335i | M-Sport, HUD, NAV, CF M Perf Trunk Spoiler, M Perf Grill, M Perf rockers, M Perf front lip