Sync of local files in playlists works on iphone, but when I play on iOS app, there's no sound.

[gurari]

Has anyone else run into the following issue: Sync of local files in playlists works on iphone, but when I play on iOS app, there's no sound. Local files play correctly on mac. Using iOS7, latest version of spotify app on both mac and ios.

If so any suggestions on how to fix? Ideally something that won't force me to resync 1,500 tracks...

Thanks!

[gurari]

Anyone out there know?