For some reason, in Emplode

Er, precisely because the "Unattached Items" playlist is hidden. Unfortunately, Tony (I think) found a bug in the move up/down buttons where emplode would crash when moving playlists in the root. It was caused by an off-by-one error directly caused by the presence of a hidden playlist.

We didn't have time to fix it before whichever release was due out next, so I simply turned the functionality off in the root playlist.

My bad.