I finally worked this out. I recently used musicbrainz to tag some files
and in some cases an obscure coverart reference was added. The result
was the messed up cover art. I also had to clear Firefox's cache to
make sure that the proper coverart loaded.
Anyway, it's all working again so it's all
i don't have any flac files, but i find this very interesting...
i keep my artwork for my mp3s in the floder, not the tag, and now that
i've learned how to do it right in SS, it works fine.
i was going to suggest clear and rescan, but apparently, u did that
already.
try making some mp3s, don't