Sometimes I will make a new playlist. Let's call it playlist "D". The next day I will open up iTunes and go to playlist "D", and "magically" tracks from a previously made playlist, (which we will call playlist "B") shows up in the "D" playlist. On top of that, playlist "B" is missing. But generally songs from one playlist will sometimes "magically" migrate onto another playlist regardless if the original playlist is missing. Anyone have this happen?