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Shoulda just called Clay, or at least gone to his forum.
That's where the answer is anyway.
You know, that ACTUALLY looks a lot like contamination from the sides of the jaws... Have you been using those a lot at minimum angles? Take a look at the base of your vise, and see if the coating is ground off. If it is, that's probably aluminum on the plates. That would just be a VERY odd spot for the diamonds to wear off, the ends tend to be the LEAST used bits of the plates.