I was able to get through that.
The camera has worked once so far. I added the PYTHONWARNINGS and rotation variables then it stopped. Removed both, one at a time, but it is still not running. Restarted and rebooted.
I get the screen with the border for the BalenaCam but there is no video feed. What debugging operations would you suggest? I will try out the cam on another RPI to confirm it works in the meantime.