OMG am I a nitwit!
For weeks (weeks!) now I have been unable to get a volume on anything having to do with youtube, which has kinda stunk, because most video these days seems to originate there.
Anyway, went through the various diagnostics ... repeatedly ... no luck.
Talking to a colleague at work about it couple days ago, and he says something along the line of "have you checked to see if you need to un-mute the application volume?"
And I'm all like, "you can do that?"
... let me admit right here that most things I learn having to do with a computer are because I went and accidentally hit some key (or sequence of keys) at some time that impacted something behind the scenes the results of which I was completely unaware ...
So I took a close look at the next youtube link I came upon (this time from http://ambulancedriverfiles.blogspot.com/ link from today's entry) and there it is.
A bright red megaphone icon with an X next to it.
I click on it, and suddenly all is well in my youtube viewing universe!