Interesting info, Henry. Thanks.
I had some time yesterday, so I drew a board in 15.2 and fiddled with the wood parameters. It took a couple of hours, but I finally got some pretty decent looking wood. The colors were never quite right, but I got good grain patterns. All in all, it was a good practice session.
Unfortunately, I still have the POOF-CRASH problem with Ver. 16, so all the practice in the world isn't going to help if I crash every time I try to render a Ver. 16 drawing.