Not getting album artwork at all?

[Stormdragon]

I was seeing similar issues so it might be related to this…

Why is my music library missing the Last.fm agent?

I assume your library is a Plex Premium Music library? These are currently in a weird state, since Gracenote is not available to Plex anymore and the new music code is still in testing. Right now, all you get are artist infos and covers from last.fm. You will have to rely on embedded metadata for a few weeks, until work is done and the new code is released.

I found that if you edit the library and change the Last.fm to Personal Media I would then see all the covers. I also unchecked the Last.fm in the settings > agents section.