To get on topic: As this is a new release, it may also contain networking changes (and other changes like any other new release). It’s usually the RAATServer component that’s responsible for making available output devices accessible. If I had your problems, I would first restart my Roon Core and then, if the problem still persists, look at firewalls/antivirus installations and temporarily disable them as a test to see if it creates a change in behavior. Looking into the logs, the RAATServer logs specifically, may also reveal something.