When I tried to save a newly created playlist I got a 500 XHR with message: "failed to fetch user playlists: Error 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND disabled = 0' at line 4", about 2mins ago, if that help finding this is logs.
Oops that's embarassing - it should be good now :) Thanks! That was a classic case of fixing one thing and breaking another, which my tests didn't catch :(