I am experiencing the exact same issue on my laptop running Pandora on Chrome browser. During my troubleshooting attempt, I selected Shuffle All and now Custom is grayed out and unselectable. Coincidentally, the shuffle on my mobile has stopped functioning properly. On my mobile, it allows me to select/deselect my stations to shuffle, but the app continues to shuffle all of my stations. I, too, would like a solution to this or even some workaround to help me get shuffle working again!
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