Hello, strange thing happen to my mp3 sound tracks in iTunes on my iMac with "Norton Security". A bogus picture appeared on one of my mp3 track but the "artwork" file is empty. 6 month later when I checked my iTunes again this bogus picture appeared on 15 other tracks, so it looks like it is duplicating or migrating to other tracks. Now to the picture, it has 4 naked Ladies on it with their whole body backside shown. Obviously it is not a serious virus as Norton Security did not catch it. Are there others out there with the same problem ?