I finally got mine to shuffle all the stations on my computer! These were the directions online: Click the carat icon next to Shuffle and choose either Shuffle All or Custom. To customize your Shuffle: You can customize the station included in your shuffle selection by: Hovering over the Shuffle On icon which will appear on the Now Playing screen which will reveal a pencil icon. I had to chose the little edit icon (looks like a pencil) next to shuffle on my main screen. It took me to another screen where I could do the above. It didn't quite work, so I went over to each of my stations, clicked the shuffle icon (which was on) to turn them off. Then, I followed the above directions, chose 'shuffle all', and voila! Hope this helps someone else!
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