Added as http://www.ventismedia.com/mantis/view.php?id=5930

1 View a playlist
http://img2.imageshack.us/img2/4631/54903261.gif
2 Click [b]Title[/b] to reorder display and select tracks for deletion
http://img137.imageshack.us/img137/3144/50576047.gif
3 Hit Delete

Expected: unselected tracks unaffected.
Observed: unselected tracks' '#' renumbered, destroying the playlist's track ordering!
http://img30.imageshack.us/img30/5702/37691051.gif

(redundant line to workaround forum's link styling bug.)