3D Connexion Space Mouse causes SU Crash

Installed space mouse with current driver (10.6.4). MacOS, 10.14.6, SU Pro 2019 (19.3.252).

With a new or existing SU file open, the space mouse operates normally. If I save/exit SU, no crashes. If I close the file window(s) and leave SU open, the moment I touch the space mouse, SU crashes. I have submitted numerous reports. I have reached out to Connexion, but still no reply. Are you experiencing this behavior?

Help appreciated.