UPDATE: Installed the latest update on two laptops. One is a 1st Gen. i7, the other is 7th Gen. i7. On both Intel machines, I have had NO issues. Streaming YTube via Firefox and Chrome runs fine. Out of my 3 machines, the update only causes issues with my FX 8370.
I am now inclined to believe that the updates don't like AMD processors.....and again MS says nothing.
Although the one I have issues is an AMD, so are the other four that don't. Somewhere is a common denominator, but be damned I can't see it. YET. still looking.