'Default' Album art problem

[nattfoedd]

Hi
I found a post with this issue but everyone seemed to be determined to misunderstand the issue so the thread owner gave up.

The problem is everytime I play a song that is not associated with any album art, a default one pops up (A clash album I don't even like =P).

To clearify;
I open John Petrucci - Glasgow Kiss (in flac, copied to an empty folder). The album art bar shows this Clash album. I open another file (in fact on another drive) and it shows the same clash album.
The only time this doesn't occur is when the file I play has got album art explicitly associated with it.

What is wrong?