@Victor Thompson: there is no media-hub code landed in the archive at all yet, so no this isn't media-hub affecting things. And there's the possibility that media-hub could in fact fix this issue. It sounds to me like the music-app is no longer in the foreground when the screen is off and so the music-app can't advance the playlist to the next song. If this is the case, this is why I think media-hub will fix this scenario with the background playlist support added.
@Victor Thompson: there is no media-hub code landed in the archive at all yet, so no this isn't media-hub affecting things. And there's the possibility that media-hub could in fact fix this issue. It sounds to me like the music-app is no longer in the foreground when the screen is off and so the music-app can't advance the playlist to the next song. If this is the case, this is why I think media-hub will fix this scenario with the background playlist support added.