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Anyone Else Had This Weird Safari/YouTube Problem?

I don't know if this is an Apple problem or a YouTube problem (YouTube, appear, to have made some design changes to their site, recently.).  I'm running the latest Sierra release (10.12.6) and the latest version of Safari on a 2010 MacBook Pro.  In recent weeks, I have had a couple of instances when I would start playing a YouTube video.  Then, I would go to full screen mode.  Instead of seeing the full screen video, the video would go, completely, black.  I could still hear the audio, though.  The video controls at the bottom of the screen would, also, disappear.  Finally, I found myself unable to get out of full screen mode.  i.e. pushing ESC did nothing.  The only thing I could do was force quit Safari.  Then, I could get my desktop back.  Then, I was able relaunch Safari and replay the video, full screen, as normal, with no issues.  Any idea what could be going on, here?

最後更新：2017-09-10 02:52:16

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