I’m probably going to pick that apart to make it more like the other rend-* files.
As far as playlist retrieval being broken, the “smart” tab shouldn’t be. If it is, then it’s something I don’t know about.
Or is it possible you have the “old” smart playlists? Those don’t work anymore. 🙂
Check the nightly notes for clues on how to re-write the smart playlists. They are more like the old .playlist file now — a playlist “script” to abstract it from the backend db.