A simple problem.
Using ProStructures V8i (SELECT series 6 R2 for AutoCAD) - Verision 08.11.11.207 from Jul112018
Autodesk AutoCAD 2016, Product Version M.151.0.0 AutoCAD 2016.0.11
The issue is the shading in AutoCAD on certain machines see504380
This should solve your display issues. Please use PS_reshade.
Best Regards
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Johannes Michalowsky
User Success Support - Bentley Systems
ServiceRequest Manager
Answer Verified By: Andrew Cairns