Issues with the latest Roon Server regarding zones!
Roon Version 1.8 (build 790) stable (64Bit)
The roon API does no more report zone changes if playback devices were added or removed. This has massive impact on rooDial and rooUPnP! If rooDial or rooUPnP is running and you power up any Roon or UPnP playback device it will no more appear in the zones setting 
I already opened a ticket at Roon, we will see when it is solved.
The only workaround is:
- First power on all your Roon and UPnP devices (if you also use rooUPnP)
- Second power on your Pi
You can then see all your devices in rooDial and rooUPnP also if they were turned off.