The Material drop down box affects the way the light scatters (i.e. it affects the maths) but not the colour. Changing these options will make a difference regardless of whether or not the Use_Material_Color box is ticked.

Each of these presets also has a colour associated with it. In Poser you can choose to use that colour or not. EZSkin always uses the texture map colour rather than the preset colour so it never ticks that box. The presets still affect the maths though, giving rise to subtly different SSS effects.

If there is a demand to be able to use the presets colours, I could add a check box to do so in EZSkin. Let me know?

Free stuff @ https://poser.cobrablade.net/