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Seems like spotify keeps closing this issue mentioning a workaround that doesn't work:
My Spotify app was in offline mode. After an android update I needed to login again. When I use the facebook option I get the message 'you are currently set to offline'; if I press 'cancel' the app just closes. If I press 'connect' I'm just staring at a black screen, nothing happens. Yes, my mobile is online.
I cannot login using a password as this is not allowed when you use Facebook as login mode.
Please don't close the issue until it is fixed!!!