It was too good to be working right from the start. One of the most unusual glitches is the view orientation of the model that was either exported from Revit or directly read by Navisworks.
See the images...
This can be corrected by activating the home view option for every isometric view that was imported from Revit.
The more important "glitch" is the inability to properly show the long-awaited new feature of Navisworks 2013, grids and levels, which are quite absent when Revit models are being upgraded to 2013 version or simply exported be previous versions or Revit and imported into Navisworks.
