Yes, since it’s a Surface Pro, I’m limited to the onboard intel GPU, which is indeed an Iris Plus Graphics 640. I did the Intel driver scan and I have the latest “greatest” installed (from May, so maybe a new one will come out soon and fix this).
Fortunately I do not need particularly huge models (my architectural models only really get fat when I’m adding 3d entourage: cars, trees, etc.) I didn’t have this SKP trouble with my surface pro 2’s GPU – is Fast Feedback a newer feature for SKP? If I turn off anti aliasing entirely, then I can use fast feedback. Otherwise I have to turn FF off, but I can do maximum texture size without a problem, and even crank anti-aliasing up to 16x; admittedly it starts to lag at that point, but no weird disappearing act.
Thanks again for the help!