Argh! This is getting downright weird.
When the box popped up again, instead of dismissing it, I clicked OK, and then told it to export the certificate.
I then went into Thunderbird and told it to import the cert.
Right off the bat, something looked odd. The entry for my ISP was a child of "unknown" rather than -- as it was before -- a child of Avast.
The Avast entry stood alone by itself, in a parent/child setup. (So frazzed that I can't recall if the parent was "unknown" or "Avast")
I took a look at the cert, and sure enough, it said it wasn't trusted, so, I clicked the button to have it be trusted, and then OK'd my way out of the dialog.
I then remembered that I hadn't looked at the sub-dialog that selects what it will be OK to handle (web, mail, software makers). Since all were unchecked, I checked them all. I then OK'd my way out of the dialogs, and looked to see if my ISP's entry was now a child of Avast.
It wasn't.
It couldn't be a child of Avast, because Avast was no longer visible!
I don't know if it was truly gone, I don't know if it was "merely" invisible.
I do know that this crap is getting really old.
I'm just about this "-->||<--" close to saying "I give up!"
And, just as I finished typing the above sentence, Avast just poked me in the eye with that stinking alert. Again.
I guess that regardless of my resolve to not give up (or the opposite), Avast has made its intention to give up unmistakeably clear.
Ever feel like you're on an airplane, flying over an ocean, or a mountain range, or a huge inhospitable wilderness... and your pilot has quietly bailed out while no one was looking?
That's about how I feel right now. Me, and I suspect umpteen gajillion other users of TB & Avast too.
Mayday!