ZBrush 4R8 P2
I have found that the ‘VD diagnostics’ isn’t working at all. When importing the necessary files & rendering the scene, it shows them all exactly the same with no shape change at all.
When I was using ‘ZBrush 4 R8’ (no upgrades), it worked great, no issues.
Note:- Also, since the updates I have had to change the ‘setting’ of the VD(within ZBrush), as it was showing incorrectly when exported. I had to export various VD maps and apply them to find the correct one.