OK, from MacBook directly to Aesthetix DAC Roon functions normally, so the blockage point is at the Zenith. I sent an email to Innuous support and waiting to hear back. I disconnected the laptop and have the Zenith back as the main core via the iPad so the original configuration is restored, and re-checked, still not working. Unless you have any other suggestions, I’ll wait till Innuous weighs in and let you know.
Thanks
Ken