Bergep,
Thanks very much for the info, and encouragement!

As you predicted, my old Win7 box worked perfectly, and all devices are updated.

Living room: 818v3, Parasound A23+, Maggie 1.6
A/V room: 861v8, DSP7200SE L/R/C, 4x DSP320 surrounds, ID41 + Roon, UHD722, Prime+PS