I'm almost certain it came in with the Windows "Security" updates for the ransomeware "WannaCry" or whatever it was called, though I have no direct evidence. It has trashed more than videos on my computer ~IF~ I use IE11 (which I don't), and not just on this site... It's probably a configuration setting in IE11 itself that "closed" a "hole". You could try looking through the "Advanced" tab of IE11's Internet Options, though if you're like me, I do not understand most of it... I wonder if YouTube has anything in its forums yet?...
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