Hello @SEBASTIEN_GENDRE,
Thanks for contacting support, I’d be happy to take a look over the issue you are facing here. Can you please provide an overview of your system using this thread as a guide?
Furthermore, can you please confirm that you have tried restarting the Roon App and the issue still occurs? Are you able to see any of your zones under Menu -> Audio or are all of them missing? Are you able to play content on another device such as the system output? Please let me know when possible.
Thanks,
Noris