If you make any changes to shader settings you have to change the above for them to come into effect. This will however make loading a test game longer because it's compiling the shaders every time, so once you have confirmed your changes work then change forceloadtestgameshaders back to 0 and restart gameguru so you don't keep getting unnecessary shader compiling.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.
