Entire YouTube pages loads normally, including recommended videos, comments, etc. Video screen remains black, with the "worm chasing its tail" indicating it is buffering. The buffering goes on indefinitely, with video never running. Pointing to the bar at bottom of screen, thumbnail images appear showing what WOULD BE showing if the video actually worked at all. Buffer forever, run video never has been the norm since update around April 1, 2020. Wife's PC was okay until few moments ago. Hers just installed the update, which coincided with YouTube videos doing same as mine. Is there any way to undue the update? I'd prefer taking my chance wuith whatever "security threat" than to lose use of the computer. Rendering unusable for security seems poor tradeoff.