I've been watching videos on YouTube with my Fire for two years. This morning, every video I try to open throws up an error message: "This video not available on this device." WTH? I tried rebooting the Fire, but the error remains. YouTube's canned answer is that some content creators don't allow their stuff to be viewed on mobile devices. Well, that's news to me, as I've watched approximately twelve zillion videos on this tablet, and NEVER got that error before--and now NONE of the videos work???