I specifically designed my filenames to sort alphabetically the same as by track (Artist-Album-2 digit Track Number-Track Name.mp3), so I hadn't noticed that. You can use the Sort Order button to the right of the up and down buttons to sort your playlists by Track Number. Also, you can still drag-and-drop to reorder, but you have to hold down Alt to do it now. It actually says it in the status bar, but it took me a while to notice, too.