This site is being deprecated.
Please see the official X‑Plane Support page for help.
I'm not from Laminar Research, just a fellow simmer in the UK, but firstly have a look in the C:\X-Plane 11\Resources\shaders folder in File or Windows Explorer (depending on your operating system) and look down the list of files to see if the Legacy.glsl file is present as it should be, as per the following link and screenshot:-
If not, please run the X-Plane 11 Installer.exe application (not the X-Plane 11.exe application itself) and click on Update X-Plane, as per the following link & screenshot:-
Please advise results?
This site is no longer being actively maintained.