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Webcam no longer being activated/rendering

I was working on a AR game, a few months ago (4-6 months) using Unity 2017.1.1f1 version.  I now have gone back and reopened the project and the webcam no longer renders/opens, I just get a black screen.  I get the same thing when I plug in my iPhone and use UnityRemote, just a black screen.  Does anyone know why or what this issue could be?