I loaded up fsx twice and I still have the same problem. I went to KFLL to test it out there and have noticed that one building in particular almost never appears.
There's nothing wrong with the buildings, if there was a problem with Couatl, they shouldn't show up at all, not just when close. I'm sorry, but I can only confirm that everyone else that had this problem, fixed it by eventually finding a program they ran in FSX that was still running in Compatibility mode.
Other than that, it might be a video driver bug or an FSX settings problem, try the following:
- First try to reset your video driver settings to default. Be sure you don't use "Transparency Antialiasing" (or "Adaptive Anti-aliasing" ).
- If that doesn't work, try to update your video driver too.
- If that doesn't work, try to reset your %APPDATA%\Microsoft\FSX\FSX.CFG file, to have FSX rebuild a new one with default settings
- Be sure you apply the HIGHMEMFIX tweak to the FSX.CFG, you can enabled it with the Addon Manager too, that's the only setting that really needs to be applied.