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I use the Sonos application on Windows 10 and on Android devices. When I look at the list of my "Imported Playlists" i See a large number (about 34) of playlists with the name "Internal error - Invalid Atom". It looks like they are old "queues" that I created at various times. Why were they created and how do I get rid of them?
I had the same issue yesterday, I had 4 or 5 playlists that were intact but the rest had the name "Internal error - Invalid Atom" and when I opened them they all had the same set of songs from the last "Good" playlist.

I tried updating my Music Library yesterday but it was the same.

Today I went into "Music Library Settings..." on the Advanced TAB Ticked the "Music Library Permissions" box, then did another Music Library Update and now my Playlists are back with the correct songs in them.
Thanks! Worked for me too!