How do I get rid of this error icon and use QuickTime Player to record from my FaceTime HD Camera?
The FaceTime HD Camera is listed as one of the input options:
The New Audio Recording and New Screen Recording features work, but not the New Movie Recording (which uses the FaceTime HD Camera as an input).
QuickTime Player Version 10.4 (894.1)
macOS Sierra 10.12.3 (recently upgraded from 10.12.2, prior OSX Lion factory install)
late-2012 AirBook (i7, 2GHz, 8GB RAM, 400+GB free internal SSD available)