ok…updated drivers and disabled all other sound systems on my windows pc…
rebooted windows and ROCK…
still not solved…windows sound system (my usb DAC) is not found in roon.
yesterday all was fine…today there was a Roon update (on server and remote) and the windows sound systems are gone…
I think it is fair to say that this is a Roon problem…
no other updates on my windows pc today…only Roon.