thxs Dylan, I can see other audio devices, namely the imac itself, but the PSA PWD is the only output I am using. Screen shot enclosed.
After rebooting my home router, Core appears to be running without the error notice. But I have mainly just been streaming internet radio. I’ll have to try albums later. And yes, the DAC does play outside of Roon, via the PSA suggested mControl App. Oddly however, if I stream with mcontrol, then try and switch over to Roon, Roon delivers a message that the transport cannot be found. When I reboot the PSA PWD, the issue goes away. It seems as if the mcontrol does not want to ‘release’ the DAC for other software to discover it? Just guessing on that.