[Lucid:]

it's because she still has her avi from closed beta, before the white backgrounds were taken off avis and before the forum layout allowed avatars to face towards the left. So when her avi faces right, it's white-background'ed like it was during closed beta, and when it faces left, the system tries to take out the background but leaves some white pixels. I'm not quite sure what makes it try to take out the background, but I know it's caused by facing left.