I also have KLAS and it seems to be unaffected, however I've also installed some of LatinVFR's stuff and it's doing it there too so it seems to be a simulator problem moreso than a problem with the scenery itself. I know Lockheed Martin has made some odd little changes in the latest version, so who knows how that's affecting scenery.
I've attached a few screenshots. Up close, everything looks normal. At a distance, the structures are "swallowed up" by nothing (they aren't sinking into the ground). Zoomed in then, you can see what I'm talking about.


