I have the same issue dan_choo is describing.
I’ve connected a Schiit Gungnir Multibit directly to Roon Core [Windows 10 Prof.] via USB and after standby playing seems to be normal, according to the GUI, but there is no sound. I’ve helped myself to remote connect to the server so and restart Roon.
So any help on this matter would be appreciated.
Thanks
Tobi