Playlist under Qt4 interface is really unstable at the moment. At least in win32 environment. (Ticket #1899 (new defect))
It can crash by simply moving an item in the playlist, because of this commit which introduced the crash.
Ticket #1768 (closed defect: fixed) http://git.videolan.org/gitweb.cgi/vlc. ... dcebbc3081
So what will be the playlist repairing status in the next day or so?