Works normally and nobody else ever reported this before. Whenever you have a problem with black textures, try this first:
- Reinstall GSX to be sure you have all files. Missing textures will render as black.
If that doesn't fix it, do all the following:
- Update your video driver
- Reset your video driver settings to default
- Reset the FSX settings to default, by removing the following file:
%APPDATA%\Microsof\FSX\FSX.CFG
This will force FSX to rebuild a new config with all default settings. After doing this, be sure you apply the HIGHMEMFIX tweak in the Addon Manager, save the settings and restart FSX.