Trouble loading playlists

[AngryRedHerring]

I'm just dipping my toes in the water here, and I've gotten things to work with a folder of files. But when I point to a folder with an .m3u file, it either (depending on the yaml syntax) crashes on launch, or starts up VLC and opens the playlist viewer, but the playlist is empty. Here's the yaml as it is ATM:

sources:
- path: E:\Media II\Movies II\Animation\Superman.Fleischer.1941-1943.x264-HANDJOB\playlist
shuffle: false

MEDIA_EXTENSIONS: ('.mp4', '.avi', '.mov', '.mkv')
PLAYLIST_EXTENSIONS: ('.m3u')