I have premium account and a thumbs up playlist. It appears to be playing on iPhone, including while I’m streaming through Apple play in car, but no volume. Volume is fine with all other playlists.
Just to clarify, do you mean your Thumbprint Radio? If so, that's pretty strange. I've enabled a trace on your account to help me investigate. Can you please uninstall and reinstall the Pandora app on your phone and try again for me. Let me know the date, time, timezone you tried and I'll take a closer look.
