Glynor, PC version of MC has been running well for 9 hours. I've stopped playing music to leave it on with no music overnight. I am praying that it is still running in the morning.
When I said I connected Mini to line in on Sonos player, the Sonos was just acting as a powered speaker. As I said before, MC 20 crashed in 15 minutes. I know it is a network device, so I will try to devise a simple amp/speaker combo tomorrow as I don't have an active speaker here. Render was still turned on though, but its LED was red, indicating that it wasn't playing music, but it might still have been communicating on the network. Next time I test Mini I will disconnect renderer from network and turn it off completely. I have installations Friday, Saturday, Monday and Tuesday and I'm sound engineering a concert all day Sunday so I may not get to this until next week. I am more keen to know if PC is stable for several days than to keep troubleshooting Mac.
I also think the client would find it easier to have a PC laptop when it comes to ripping new CDs into the system or rebooting the computer now and then to clear out junk. My original plan was to sell him a Mini plus Apple Superdrive for CD ripping and to control it with Rowmote on his iPad. But I don't find Rowmote nearly as easy to use as an actual keyboard and mouse. For the $580 cost of the Mini and Superdrive, I hope to find a small PC laptop with some SSD for best operation of MC 20. If you have any favorite models in that price range, please let me know.
By the way, is it an expensive deal for JRiver to get "authorized" (I believe that was their term.) so they and you can communicate directly about problems like the one I am having? I am pretty helpless stuck in the middle and have so far wasted weeks of time (including before the date this thread began) and my client is naturally beginning to run out of patience. I would gladly pay $10 more for MC20, as I am sure would thousands of other Mac users, to know that there was a solid line of communication between Apple and JRiver.
Thank you Andrew! I will run DMRA tomorrow. I assume you want to see what's going on both when renderer is playing music and when it is quiescent, yes? (Since MC 20 has crashed under both circumstances.)