James, are you running in SLI mode? Because I too have had this trouble with Nvidia in SLI mode. I believe because of the way SLI works to sync the dual display, it blends the 2 images at the edge. When you are in extended desktop, that edge is on the left side. I just tried flipping the 2nd display to the other side and it reversed the problem to the right side. This may give a little help.
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