Thank you. I finally got some results that showed me why I was unable to see the pictures. The sentence "This demo application is not available on the Pi 4." answers my questions.
With a little extra time on my hands today I decided to try to get the videos for the teapot, the tiger, the triangle, etc. I've been able to get the h264 test and hello world to work, but everything else is just a mystery to me. This is just for fun and I wouldn't expect anyone to spend any time wi...
In scanning through the troubleshooting forums there are other instances of "Audio worked before upgrade" indicating that this is a common problem. I'm just hoping that someone can come up with a fix.
My workaround is that I have a card with Raspian that I use only for Audacity.