I am also getting the bug where everything seems to kind of randomly become reduced in brightness. Saving and loading doesn't fix it. Restarting the game doesn't fix it. the only thing I've seen fix it so far is a fresh install of the game with no mod, and loading a previous save before the screen goes dark. Afterward I re-install the mod and it works fine for a little while, but inevitably goes dark again. I am not using the compressed version either.