Hereby the answer of the Space Navigator question (from Graphisoft)
Space Navigator needs more "components" in AC to be able to work.
One of this component is the "framework".
You had problem on MAC with the space navigator, because this component was not updated from AC11 970 to AC11 1086.
This problem could happen, because there was a long procedure between 3Dconnexion company and between Graphisoft.
The perfect solution will be in the next hotfix.
Thanks for understanding.