what the title says:
I cant get the screenspace shaders to work , it just returns a black image on the plane im using.
i tried in 3.6 , 4.0 and 4.1 nothing seems to work
Heya - posting answer here, just for future reader reference 
You need to be sure refraction is turned on in both the material and the render settings.
People often overlook that one.
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