I had a problem with the preview after the recent update. It wasn't quite the same as yours. My problem was that the preview window was showing too much blue. I solved it by turning off the use graphic processor option. Go to Edit/Preferences/Camera Raw and then untick the use graphics processor...
I would also vote for the Tamron 17-50. I've used it as a walkabout lens for a couple of years. I went full frame yesterday and got a Canon 17-40L. It's too early to comment properly, but I'm hard pressed so far to see any difference in IQ in the few photos I've taken so far.
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