Hello,
I installed a new video card and when I started FSX I noticed KIAH had buildings but large holes in the ground. The same thing appeared with P3D. I did the following:
1. I selected my antivirus to allow the Addon folder.
2. Uninstalled KIAH and GSX
2. I disabled my antivirus and downloaded/reinstalled KIAH and GSX, registering SODE again. Now I have no buildings, only jetways showing in both flight programs.
4. I uninstalled all the C+++ 2005 and 2015 programs then downloaded and installed again from the microsoft site. Still no change.
5. I rebooted my computer each time a did an uninstall/reinstall.
6. The Addon and GSX are showing up under the add-on menu.
7. I selected to rebuild cache each time I made a change. Still have the same problem.
I have KDFW, KFLL, all of Hawaiian Islands, KJFK, KLAS, KMEM, KSDF, KCLT, and KLAX. The airports appear to be working properly. It is just KIAH.