Renderotica

I don't know, I just tested G9 with Dicktator ant the two Fender Blender grafts, and the script works for me.

Only bug I was notified is that the fix can be reversed when you use tools like the Geometry editor.

Can try...

::: (After All Grafts and Shells are Applied, as the Shell Surfaces will stack by default) :::
Select a Shell in Scene
Go into Parameters Tab / Shell / Visibility
Then for Face Groups and Surfaces
Right Click and check Edit Mode to activate Editing
Select the first Face Group or Surface
Then scroll to the last Face Group or Surface at the bottom
Hold Shift and Click (Selecting them all)
Then Right Click over the newly selected Face Groups or Surfaces Selection
Go down to Set
Go down to Values
Toggle the Current Values and Default Values to OFF
(This should Turn OFF ALL the Shells Face Groups Or Surfaces)
Then Reselect the only the Face Group or Surfaces (careful with GP9 there are a lot) that are associated with the Shell currently selected in the scene
Toggle their values to ON.
Right click and exit Edit Mode.

Repeat the steps again for any additional Shells.
(ie: Foreskin doesn't need the mouth, fingernails, toenails, etc overlap)

Hope it helps.
Otherwise, Id say look into the UVs perhaps. However, UV errors usually show at Mat Copy before Shell Loading.

This worked for me

First, use the 0-G9 Selector and the 1-Dicktator_Smart
Then use the 2-Dicktator_Material Copy
In the 01-Material Presets folder apply the nearest preset to your character skin
Then apply the Bump, Veins and Testical Wrinkles
All of this is done with the Genesis 9 figure selected
THEN, and I think this might be the crucial bit, Render
The Veins etc are displacements and only show upon rendering

I took it verbatum from Haruchai.