I think the image that they have stored here is fine though, since the download version is fine. There maybe is some bug in their scaling algorithm for doing the "full view" since it's still smaller than the real pic. You could try making a copy of the pic, resizing it down very slightly and then uploading again to see if that helps?
Scaling algorithm, as in the process they run on the pictures to resize them for the small and full views (which in this case are both smaller than the size of the real pic you uploaded). Never mind, I'm a bit of a programming geek
I've gotta say, I never noticed the black line going through the middle, until I read your descripton... But I should hopefully have some new deviations within the next day or two, so I'll let you know if it happens to any of mine