I have thoroughly read all the posts on this topic, to no avail. I am running Roon 1.3 on MacOS 10.12.3. I removed LMS and rebooted the Mac. I reset the Duet to factory settings and restarted that. Roon can see the squeezeboxes, and on the Duet, the controller can see the Roon feed in Now Playing. But there is no output from the Duet or from any of the other SBs.
Any ideas you may have for troubleshooting this further will be appreciated.