I threw a V-Ray sun using a V-Ray physical camera in my scene. I've never run into this problem before. What they hell? Here is my scene with all my settings shown: http://i.imgur.com/mu4t67E.jpg
It's because your V-Ray Sun is pointing in the wrong direction. In your screenshot, on the "bottom" of the Sun you can see a small arrow pointing up perpendicular with the other lines of the Sun. You need to swap the Sun around, as that arrow is the light direction.
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