I have this problem too. I know how to change the picture. I wanted to change the playlist picture to a new one i do and it stays as the new one for a bit. Then i click a new playlist and i go back and the playlist cover is back to the one i had before and i dont know why this is happening.
Today I was having this same issue. I found it helpful to first remove the artwork from the playlist (remembering to save it that way), and then to re-add it after this. Same for playlist descriptions.
I have what is probably the same issue. One person said the image updates after a few days. My image updates immediately for me within the app itself. However if I click share to Facebook Messenger (or Facebook, or Skype) the artwork appearing the share dialog is yesterday's artwork. If it eventually works this is obviously an eventual consistency problem.
Thanks for reaching out to the Community about this.
Just to double-check, have you tried the clean reinstall that @GabeValentine suggested? We recommend this step as it'll remove the old drivers first and then install the new ones. It'll also get you the latest version of Spotify.
To perform the clean reinstall steps, simply head to this help page.
Hope this helps. Keep us posted.
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“Music is the strongest form of magic.” Marilyn Manson