http://skyrim.nexusmods.com/mods/5152 I recently downloaded this hair mod and found the shadows of external objects don't fall onto the hair but it works when I use the default hairs so I am pretty sure there is nothing wrong with my game. beside I even turned off the Realistic Lighting mod which I currently use to enhance the immersion of the game and checked how it works but still the same result appears so I am wondering how do I fix this issue. if you are not sure what is the exact problem then here are two screenshots I took from my game. This is how it appears when I am not in the shadow http://i46.tinypic.com/2vcc0sg.jpg This is how it appears when I am in the shadow http://i49.tinypic.com/2n9guxl.jpg I suppose you can obviously see the shadows don't fall on the hair properly. so what can I do it fix this issue?