After a bunch of tweaking with settings for a couple of days, on a flight from KORD-KLAX, all the ground textures, various outlying airport buildings and auto-gen buildings around LAX we looking good. However, the terminal, tower, various inner airport buildings, jetways and just the bodies of tugs and vehicles (but axels and wheels I could see?) were missing.
RIA, Re-Install Again is the answer I'll wager. Especially since I've tweaked with my sim settings recently.
Matt