Hello, am trying to put together walkthroughs in Navis Simulate 2013. I've appended my Revit MEP and Stru 2013 files and the Architects Revit file (which is exported from Archicad) The problem I have is that some of the ductwork is not showing and the floors are not showing at all. I've tried purging and auditing the models but not joy. Any ideas, first time using Navisworks on a job.