Shaders won't work

Hi, I'm using the newest version of DH and try to use shader via Iris. Yet when I enable any shader with DH Rendering enabled stuff breaks (how much depends on shaderpack). I've tried switching to other version, updating everything (even gone to Optifine) but nothing works. Does anybody know what might be a solution?
Thanks

(The pictures are a comparison to DH Rendering On vs Off)