It was all fine for a long period of time.
Then ZBrush installed GoZ plug-in for Maya.
Since then on every Maya startup I got this message, and Navigator is not working.
Solutions ?
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SpaceNavigator
Windows 7 (64 bit)
GoZ adds its own usersetup.mel file that overwrites the one with the 3Dconnexion startup command. To confirm this is the problem you are seeing, type "MagellanStartup" [ without the quotes ] at the Maya command line. This should enable navigation.
To have the 3Dconnexion add-in start at Maya startup, open the usersetup.mel with a plain text editor [ie Windows Notepad] and add this line at the end