Everytime my brother uses fast user switching to get to his account while I'm using mine, the wallpaper that appears during the 'quick flip' animation is different from his own user wallpaper. This is only a problem because it is a picture of his ex-girlfriend kissing him. He hates his ex and doesn't want to see the picture flash everytime he logs into his account. I've reset the computer, had him log in and out, all with no luck. The photo was taken with Photo Booth, if that helps at all. I think he has already deleted it, so I'm not sure why it would appear in the animation.