For some reason, since the update, whenever I unmount and remount my ext SD card, it wipes out my playlists! The Playlist title is there, but all the songs are gone, and I have had to re-add them about 5 different times now. I know the SD cards got renamed after the update, and it took me a while to get everything back to normal, except the playlist problem. The only song that still shows an a playlist, is the only one I bought from the Play Store, all the others are on my ext SD which I copied from my home music. It all worked fine with ICS...
It does the same with either Google Play Music or a addon like Android Music. I even tried moving Android Music app from Phone to Internal Storage, and it makes now diff.
Any suggestion would be greatly appreciated!