OddJobber wrote:
As Dngallagher requested up there, please check the "store original" box so we can see your settings. I am fairly certain, though, that we can rule out pepperoni as the culprit. That's some progress. PLEASE help us to help you. To me that totally looks like you were shooting with flash at a shutter speed faster than your flash synch speed but you shot at an angle to the computer screen so I don't know if the flash was on or not.
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I agree that using too high a shutter speed with flash could give you the black portion of the picture area. BUT. that would not be visible in the viewfinder, only in the produced / resultant image. Must be something within the camera / lens light path.