The question probably is which font iTunes is using there. I've seen this happen as well, btw. - it's ugly. And since it doesn't _always_ happen (and only after some time), it doesn't seem like it's a plain old font issue, where you have two fonts of too similar name/ID or something. In my opinion, it's an iTunes 7.x bug of some kind that only appears when some other condition is present as well, although I wouldn't know which. :/