The playback button doesn't work.
This problem can occur when the playback is paused when an external app such as a camera is being run. In this case, you can continue using the app by going to the iOS7 control panel to set the playback again.
The playlist display is incorrect. I cannot play music.
This problem can occur when you play a playlist or similar using other apps such as the iOS music player. Please use MJ7 to set the playlist again.