FaceTime HD camera available in FaceTime but not PhotoBooth
iMac 5K: the FaceTime Camera works in FaceTime but not PhotoBooth. The screen is black, the take photo button red, and Camera menu items are grey (one of them is "No camera available".
Presumably not a hardware issue, but a bug in PhotoBooth. I have tried deleting the com.apple.photobooth.plist in ~/Library/Preferences, and the corresponding items in ~/Library/Containers to no avail.
Is it possible to download a fresh copy of PhotoBooth? I can't see it in AppStore.
PhotoBooth 8.0 (812); Sierra 10.12.2.
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iMac with Retina 5K display, Sierra 10.12.2