I think it could be the Starred playlist that of some reason is causing problems (the playlist state changed log message refers to the starred playlist); somehow the other playlists are not loaded successfully from the Spotify backend. Have you made some changes to the Starred playlist that possible could explain this?

QSpot is stucked at loading playlists due to it having received info that some particular number of playlists need to be loaded, but the playlist metadata is not received from Spotify of some reason.