Hi tsawyer,
what controls the automatic download of album art?
,
RuneAudio searches for cover art in this order:
1. try to find embedded cover art (mp3 and flac)
2. try to find local cover art (folder.jpg / cover.jpg / folder.png / cover.png)
3.0 try to find cover art on Last.FM (Album)
3.1 try to find cover art on Last.FM (Artist)
4. serve DEFAULT rune-cover image
So the best way to get consistent cover display is to embed the pictures in your music files as "janui" explained.
Frank