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Using premium with 2015 Macbook Pro on 10.12.While it would let me create new playlists, adding songs to it would result in a constantly loading screen. Have updated to the latest version at still same result.
Is it possible for you to try a clean reinstall desribed here: https://support.spotify.com/using_spotify/troubleshooting2/reinstallation-of-spotify/
Let me know if it changes anything 🙂