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Well, I sat while it downloaded the high res photo & just as it ended, it switched back to the standard res!
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That is normal. Once it reverts to smaller resolution. try moving your mouse off the image, then back onto it. Then, a small button with outward pointing arrows should appear, usually in the lower right corner of the image. HOver your mouse over that button and you will see a message to the effect of "click to enlarge" (or something like that). Click the center of that button and it will (should) make it revert back to the full sized image.
Basil