Happy Days are Here Again!Thanks for all the help, Jin. I finally got it through my thick skull how brushes are supposed to work. That's part of the good news.
The bad news is that it sorta' worked, but not really. I kept getting error messages and a few of the brushes that would open had variants they shouldn't have had. Example: the 2B pencil made strokes from the impressionist brush! To add to my aggravation, the error messages (see below) came up each time I selected a brush. The brush would finally build, but most didn't work as they should, and they had no nib size showing in the brush palette. I tried the Fun brushes and several other sets. Only a few of them worked properly, and even those had to go through the error messages each time they were selected.
It appears I had corrupt files. Also, Painter 8 suddenly quit a couple of times during this process.
Since waiting for a brush to be built every time it was selected, and then not do what it was intended to do, was such a pain, I went digging through my backup files looking for a copy of the original, never converted Painter Classic brushes to see if that would work.
The rest of the good news: To my surprise, I found an old set of Intous brushes that are the same brushes as my old Painter Classic set. I have no memory of these Intous brushes. They must have been included in a Wacom tablet purchase at some point.
Be that as it may, they are exact duplicates of the Painter Classic brushes I've always used.
I dragged a copy of that set into the brushes folder of Painter 8 and they work!!!
All is well that ends well. Thanks again, Jin.