I was having the same issue. I am running Apachii, MToH, Lovely hair as well as coolism's hair and 3 or 4 eye mods. I also use extended colors. It would freeze up or ctd quite a bit but not always. I tried Bella, coverwomen or univision without any change. I tried uninstalling a hairpack and was able to run showracemenu. It started to act up again so I tried uninstalling another hair mod and still had the ctd. After working around with different combos with mixed results, I had a brainstorm it wasn't any of the mods I used it was were I was in the world. What I did was enter a small room with absolutely nothing in it and have had zero issues with running all of my appearance mods. This might work for you might not. I am running over 200 mods quite a few are graphic intensive. I am guessing because it has to load up so much information before running showracemenu that it bogs down my pc.