Sorry for posting to an old thread, but I think I've found something relevant to this. Pandora seems to automatically create playlists for songs that were "thumbed up" in that station. When you give a thumbs up, that song is listed in both "My Thumbs Up" AND the thumbs up list for that station. For example I have a "Rock and Roll Radio" station. If I thumb up on that station, it gets added to "My Thumbs Up" AND "Rock and Roll Radio Thumbs Up." Here's the problem: playlists seem to constantly disappear and reappear in the playlist section. For a while even my "My Thumbs Up" station disappeared, now it's back. To test this, I played a station on my Android phone that DOES have a matching thumbs up playlist. Any song I thumbed up added to both of the playlists, with no errors. When I tried on a station that didn't have a matching thumbs up playlist, I got an error. So the answer here seems to be that the error is correct. And if that's the case it is staggering that this problem has continued this long without resolution. As far as the playlists disappearing, I've tried reinstalling, clearing data and cache, etc. Which playlists get restored each time seems somewhat random. Last time I had 2 re-appear after a reinstall (out of 12), then 2 more reappeared right before my eyes in Pandora while I was checking. It's now been another hour since reinstall, and still only 4 are listed. Online my account shows 12.
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