I would like to reiterate what MGJ already said: when you right-click, the box pops up that says "show playlists". It is very annoying. I hope its a bug, but if its not, I think its better just to open the playlists from the File menu.
I'm also having cut, copy, and paste problems. Occasionally it works, but sometimes it doesnt, saying at the bottom of the screen, "Internal Program Error: c0000005 address: 5c0715". Also, when pasting, it sometimes doesnt paste, instead changing the "pasted measures" to treble clef and signature to C major. I've had this problem a long time ago with an earlier version (I dont remember which one), and didn't expect it to come back.
~Daniel