Instructions
Go to the FlightSimLabs website (see Resources) and download the free texture fix utility.
Right click on the downloaded file and select "Extract All." Specify a destination (the folder where your copy of "FSX" is installed, for example) and click "Extract."
Navigate to the folder where your copy of "FSX" is installed, and make a backup of the "FSX.Cfg" file. The texture fix program performs this action automatically, but it is always good to have an extra backup.
Double click the "FSL_TextureFix_v1.0.exe" file to launch the program. The program will automatically detect the folder where your copy of "FSX" is installed.
Click "Apply Changes!" at the bottom of the program screen to apply the texture fix to your copy of the game. Click "Yes" when asked if you want to continue, and then click "Exit."
Start your copy of "FSX," and you will find that the disappearing texture problem will be fixed.