Spotify App won't load on Samsung TV model UE50KU6000K

[BCSR]

Spotify App won't load on Samsung TV model UE50KU6000K The spotify app won't load on my TV any more. It was working yesterday but now when I launch it starts to load - I see the white circle for a second, – then it goes to a black screen and nothing happens. I have tried deleting and reinstalling the app. Resetting the smarthub. Switching the TV off for a minute or so and then switching it back on. All the other Apps seem to work normally, Spotify works on my other devices and it appears the TV has a good internet connection. Any suggestions? The software says it is up to date and is version 1242.