Does the first album art not show up in the Tag Editor, where you can delete it?
When I right click the currently playing song in the playlist and choose Edit, there is information under the Tags tab, but nothing under the Tags (2) tab. Also, when I click the Artwork tab, I get a message stating 'A picture is corrupted, no longer exists or is inaccessible.'
If I highlight the currently playing song and hit Shift+Enter, I see the album artwork thumbnail on the Artwork tab, but if I click to another tab, such as Tags (2), then back to Artwork, I get the same message 'A picture is corrupted, no longer exists or is inaccessible.'
Does that help?