I have a Pandora One account and have never had this before. As you can see in the YouTube video below, it just scrolls through songs and never actually starts playing them. I've tried resetting the app and this did nothing.
When I tried playing in my Waterfox 56.0.3 x64 and Chrome 63.0.3239.132 x64, all I get is a spinning CD icon and no playback.
Playback on my Android device is normal.
addendum: A reboot seems to have cleared the cobwebs.
Edited by OmegaWolf747, 20 January 2018 - 02:02 PM.