Look at the log file generated when importing the ifc into Navisworks. My assumption would be there is errors during the import bringing nothing in. You should see a line that says something like Elements created. This should have a count if no errors were encountered.
Nathan Chapman
Production Manager at General Heating and Air Conditioning
Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author
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