My Nikon D40 causes a black blotch/line on my photos.. You can't see it when your looking in the viewfinder. It only appears after you take the picture. I have 2 lenses- but neither of them seem to be the cause of the problem. It's somewhere in the camera.. because it's the exact same mark in the same place, no matter the lense. If you have had the same problem or have an idea on how to fix it, I would greatly appreciate it. Just a few quick snaps to show what it is that I am talking about.