So, recently when I was trying out the OK_Custom Voice Followers_SE I ran into issue with the followers fading into invisibility, where you can't see them, but you can still interact with them.   Apparently this is an HDT issue, and I did find out a temporary solution for this, that I did not find mentioned so I'll put it here:   And to be clear, I am using specifically the FSMP - Faster HDT-SMP.   The solution is to go to the Skyrim Special Edition\Data\SKSE\Plugin