Initially, after updating to OS X 10.9.2, all seemed fine with my 2009 Mac Pro. Then I launched Skype. The application could no longer detect the camera built into my 24-inch Cinema Display. I quickly confirmed that this failure was not specific to Skype. It extended to all programs that accessed the camera--notably Apple's FaceTime and Photo Booth. For example, shortly after launching Photo Booth, a message appeared that said "There is no connected camera."
