I think something's wrong with gzdoom because sometimes when i walk on my map it flickers!
I don't know what's happening here's link to the wad because it's too large to attach it happens on the left side of waterfall section black.zip - 0.39MB
Ugh. Okay, I see. Well, I'm just going to remove dynamic lights for now until someone straightens this out. Dynamic lights were ruining a few mods anyway.
Personally I prefer to disable the shaders in the opengl menu. All that means is the warping floors warp like they do in Zdoom rather than the super-smooth shader warping of GZdoom.