Hey @Bruce_Dennis,
Thank you for going through the above! After freshly digging into your account a bit more, I’ve discovered that you are experiencing a known issue relating to crashing on Mac’s.
You can see this related thread for more information: Roon 2.0 - Crashing on MacOS due to ".NET ThreadPool Worker" [Roon Investigating]
Our team is actively working on a fix for this, and should have more information to share soon. Unfortunately, I don’t have any immediate next steps for you. We’ve seen some success in temporary workarounds downloading RoonServer on your Mac and using other devices as Remotes (again, as a temporary workaround)