I work alot with character rendering and animation, and as such my skin shader are always a mix of several materials.
right now im using as a base the tony sculptor skin r20, and whenever I apply the shader to my character in the viewport it shows up as pure tranparent with only some highlights...this in MAX 2017 and 4.21 oct.3.0, it makes it VERY HARD to animate and to ani previews...to be able to see the character i have to always be in performance mode but this of course ditches all textures and shows only object shaded.. is it possible to AT LEAST have it like before?
Before if memory serves me right, if we were to press "show shaded material in VP" it would ignore all shader settings and would force material to be shown in viewport, regardless of of the shader.
Please do this

Nildo