I'm using a wired space navigator firmware 4.35, drivers on mac version 10.2.2 (Updated to latest at the time of writing).
iMac Retina 5k, Yosemite 10.10.3 all up to date.
Only space navigator connected with USB port.
Nothing running.
Even calibrating the demo (3d crate) doesn't have any effect, crate spins like crazy. Device on a solid table untouched.
It looks like Calibrate button in control panel / 3cconnexion doesnt actually do anything, no feedbacks.
As it stands now it's completely unusable

Any advice?