The problem doesn't happen here, and nobody ever reported it so, it's looks like a problem with your video card, or settings or tweaks, or a combination of them, because it seems your texture memory is corrupted so a texture ended up on the wrong place.
Try 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:
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.