For the first time ever today after using various Macs for 10+years, I was suddenly met with this screen upon launching FaceTime:
How to fix this?
A restart (as with most things) sorted it out for a short while, but the issue returned again after the next time that the system re-awoke from sleep mode. A little Googling suggested running the following commands in turn from a Terminal window:
sudo killall VDCAssistant
and then after that, this:
sudo killall AppleCameraAssistant
And that’s seems to do the trick!