This has nothing to do with the graphic card, it is a bug with Coppercube itself. I am not sure how you tried moving the extensions to other folder. I suggest you to just put this action only in the extensions directory and move all the extensions to a different location. Then close Coppercube editor if it is running already, now restart Coppercube and check if it shows up in the scripted actions.
Viewing post in Screen Shaders (CopperCube extension) comments
It does show up in the scripted actions but for some reason it just stays fully transparent once I put it to (transparent add) with a black texture. Once I put the shader on it stays transparent but I can't see any of the shader stuff. I tried changing it back to solid to see if it's in front of the camera and it is so I'm not sure what I did wrong. Pretty much I followed your video exactly so that's why I was thinking it must be something wrong with my graphics settings idk. Don't get any console errors and I made sure it's openGL both things so it SHOULD work I think but for some reason I don't see the shader effects