Looks great. It seems like you disabled the ability to use playlists, because they can't start playing.
There are no working buttons that let a playlist play. There is a shuffle and a play button, but neither of these launch the playlist.
Using v3-build-814-play (Full Version)
Go to playlists, tap once to go into the playlist. It lists all the songs. You have the name of the playlist superimposed on the album art, then the shuffle / play / select buttons. Shuffle and play do not shuffle or play, and select lets you pick songs for editing. No error messages are present.
This means if you have, say, a running playlist, you can't play your running songs, which is why I'm sitting at my computer instead of outside running.