The calibration of the Tobii Pro VR Integration freezes

VR Integration Tobii Pro
a.    If the lighthouses lose connection to the VR Headset or get disturbed during the calibration process the calibration can freeze. Restart the unity executable and try again.
b.    Another potential issue is the Tobii service. Open the desktop app Services (by searching Windows for Services), look up Tobii service and restart it.