Mine did the same thing. Pandora was working fine on samsung s4 with android 4.3 and a mid level paid subscription to Pandora. After I upgraded my subscription to the top of the line version, it no longer works on the Samsung s4. I've tried clearing cache, uninstalling and reinstalling, but its still stuck on "signing in". Do I need to revert to the cheaper version of Pandora to use it on the older phone?
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