(iOS Windows 10,etc.)
My Question or Issue
Just recently after resyncing offline playlists my Desktop player doesn't show any artwork at all? Not just the odd song missing art but all of them?
Is that issue happening with your local files or all (including streamed) songs?
If it's with all music, I suggest moving the edge of the left sidebar a little.
Move your cursor to there:
And then drag it a bit. :)
Let me know how it goes!