Airport buildings disappear!

Hi, hope i am in the correct place.

i need some help to solve a problem that I have since few days ago (never happen before), the only things I do in this days were to uninstall tileproxy (i did not use it) and add some addon aircraft. The problem is that airport buildings simply disappear, only the jetways remain, and sometimes ai aircraft become trasparent (i can see only gear and engines). I talk about fsx default airport, I checked some european airport such schiphol, hamburg, geneve.. All default ones. The graphic settings are always the same, I never have this isssue before. Anyway I try reduce quality and AI traffic to increase performance, but they still disappear. I noticed that autogen and other buildings are correct.

Have ou got any idea of that?

Thanks!!

This is my set:

Fsx deluxe sp2

Utx usa and europe

Gex usa and africa middle east

My traffic X 5.4c

Orbx PNW (disabled)

marco