SketchUp to Navisworks issue

Hi there.

My client sent me their 3D MXRoad design so I could import to SketchUp . I added other layers, tidied the model up a bit and exported back to AutoCAD. This was then saved as a .NWC file in Navisworks for a clash detection assessment with other parts of the design completed by others.

I have been told that even though the faces could be seen in the 3D AutoCAD model, once transferred to Navisworks, the faces cannot be seen.

I note that on the web we can import directly into Navisworks from SketchUp - is this correct? can .SKP files be imported into Navisworks?

Any help would be brilliant…