Have you tried logging out, and then logging in again? And have you tried clearing the application cache? In case the problem remains, could you get the output from the application by running it from x-term?
$ /opt/qspot/bin/qspot Unsupported date format character at 1 (%-d.%-m.) > set_stream 'QSpot' SetOfflineMode: false , false Connection state: 0 No stored credentials.. Display login window.. MESSAGE (log): "19:21:00.854 I [ap:1766] Connecting to AP ap.spotify.com:4070" Logged in OK.. User loaded OK.. Registering container callbacks.. Container callbacks registered.. MESSAGE (log): "19:21:00.998 I [ap:1224] Connected to AP: 78.31.12.95:4070" Connection state: 4 MESSAGE (log): "19:21:01.157 I [offline-mgr:2143] Storage has been cleaned" Connection state: 1 Playlist state changed..