I'm getting something like this, when I do the preview: Click image for larger version. 

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Scans are showing up the same way. I seem to be able to get away with a couple per session without this problem, and then this crops up about halfway through. What is going on? I've tried cleaning the two sensor windows adjacent to the scanning surface, I've tried repositioning the betterscanning tray. Nothing works. It wasn't doing this six months ago, however, I haven't moved it or done anything significant to it.