I've tried dealing with KeyShot support, but thus far it hasn't improved my situation. For some odd reason, starting early last, KeyShot will shut down when I try to add materials or environment to my project.
I've uninstalled, removed all residual folders, installed again, tried Solid Edge install repair, and even tried wearing an aluminum foil hat. I can get it to work after fiddling with stuff, and the next day it won't run.
If I have the settings on the main page to use all CPU cores (not rendering screen), my system shows 100% CPU usage when I have a project opened.
I have 8 CORES on my Dual Xeon CPU system, but I only use 6 for Keyshot. I found it keeps the system from getting too hot, and it really doesn't hurt performance much.