Hello @John_Roberts,
Thank you for providing those screenshots, they confirm that you have selected the proper JRiver device in Roon and we can rule that piece of the puzzle out. My followup question here is are you able to use any application to output to that JRiver ASIO driver? As in if you download foobar2000 and attempt to play content to JRiver that way, does it work? If it doesn’t work from foobar then it is likely an ASIO driver issue at play here and we would need to take a closer look at those drivers. Please let me know if you are able to run this test and confirm if the JRiver ASIO driver is working as expected.
Thanks,
Noris