Why are the faces missing on the imported object?  One time it's the wheels, next time something else. And sometimes a whole piece or more isn't there.  It seems to work fine in Poser 5, top left in the image, (the only other version I had to try it in.)  And as far as I can see the normals (top right in image) are OK & no backfaces showing on export from the modeler. 

This isn't the first time this has happened & it's beginning to get really frustrating. 

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