I completed installing all my FSDT sceneries, along with Flightbeam's KSFO, and all the buildings are showing up just fine.
As for my choice of title as you quote it, laxclipper, "Screw up", try to put things in perspective. I'm from NYC, and I guess I call it as I see it. If something is not working the way it should, there is a loose screw somewhere, that's what I call a screw up. You then fix the problem, and you have lowered and tighten the screw.
That said, I'm very impressed with Umberto's response and persistence in getting to the bottom of the problem. It's not a reflection on him, I'm sure he has tried his best, and he's entitled to a mistake or two. Hell! we've all screwed up one time or another, and who ever says he hasn't, I'm willing to put up a title called "Liar".