Thanks and interesting that you mentioned autogen @Kludger. The only ORBX airport that is acting funny in P3Dv3 is Vashon Island (2S1), which is a freebie. So, not sure how motivated ORBX is to migrate it. Anyway, what is does is when the aircraft is using runway 17, none of the 3D buildings are visible. But takeoff, and land on 35 and they all appear, only to disappear when you turn back on the reciprocal heading. I tried sliding autogen to max, but that didn't solve the issue.
Anyway, Vashon is a really cool little airport not too far from SEATAC, but much more FPS friendly. I have some friends who live on Vashon, so fun to demo the scenery when they visit us. Orcas Island (KORS), Stark's Twin Oaks (7S3), and Darrington Muni (1S2) all work perfectly in PNW, so don't think that it's an install issue. Vashon to Orcas for the $50 hamburger is a short fun scenic trip.
Having spent a bunch of time in X-Plane lately, I'm really appreciating the stock clouds in P3D. Not particualarly good in my screenshot above, but flying in and around them they look great.