I don't know where is EDIT button but I write here. In my Big Sur pc "Find My" and "Photo Booth" don't work.
Photo Booth is broken!— well, at least in my user account. Hey, I actually like Photo Booth and need to use it from time to time.
Interesting observation: If I switch to a test account, open Photo Booth there, it work just fine, shows what the camera sees. So, not a hardware issue.
Back to
my account: When Photo Booth opens on our MBP, the dinky green light comes on atop our display, yet the app won't display the camera's output; it's black. No problem with the camera, however, with FaceTime, FCPX, Zoom or similar. Didn't work in Safe Mode. Switching to a different user, as mentioned above, remedies the problem; but I want it to work in
my user account. And I really want to understand what's going on here.
Apple Support suggested I reinstall 11.0.1, which I dutifully did. And no, it didn't help.
Then I noticed something curious. Back in my account, if I option+drag and make a copy of Photo Booth,
that version, when opened, immediately displays the camera's output. Hm, and yet the original version still fails. But not the second! Why?