that's the difference I see here.
All of my art is stored externally. If a file has no art, it will show the default MC logo, but, if the file has art specified in its [image file] tag, and the specified file does not exist in the specified location, it shows surfin' jukebox instead.
I have never seen surfin' jukebox in a vizualisation for any other reason.
My suggestion to you is, that next time you see it, you find that file in your library and use the tag window to investigate its [image file] properties. Don't rely purely on the little thumbnail in the top left of the tag window, click on it to get to the full image file window and see if there are any clues there for you.