Spotty stops after one song

I have the Spotty plugin doing Spotify connect on an old Squeezebox 1, which is truly marvellous.
However, after upgrading my Logitech Media Server from 7.7.5 to 7.7.6 it will only play one song and then it stops. I can make it play another one, but it stops after that as well.
If I go to the Spotify app / Devices available on my computer or phone and change away from the Squeezebox, the problem goes away.

This is really disappointing. Does anyone know how I might fix it? Would "downgrading" to 7.7.5 work and if so, where can I get it?

Thanks,

David

iMac i7 27" late 2013 OSX El Capitan 10.11.6
Spotify 1.0.80.474