I have REX installed and I believe that it is causing the same problem for me. Is their anything I can do to keep on using REX and not have the conflict of 'shaders' messing up my FSDT DFW ground textures?
I am running all the REX stuff as well and it hasn't done anything to mine.
Have you tried rebuilding your shader cache? I'm not running any of those shader mods, like the one by Jesus for example, but my problem was a one off and fixed by a simple reinstall.