Issue:
When a Factory Model that was created using the Autodesk Factory Design Utility (FDU) is loaded into Autodesk Navisworks Manage, some of the FDU assets are missing.
Causes:
The usual suggestions are not working for when some parts from the Inventor model are missing or displayed differently in Navisworks, as detailed here and here.
Solution:
The confirmed solution was to open a new Navisworks project and import the .iam assembly. That also dramatically decreased the load times and solved a display anomaly with views shown from the view cube.
Special thanks for developing the confirmed solution by Michael Horst.
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