Thanks for your message. Has ARC ever worked for your Mac Mini before or is this a new install? Sometimes Linux firewalls can interfere with ARC being set up properly, have you tried to temporarily host the Roon Core/Server on a different PC and check if the issue is the same?
If you are using the production version on your Roon Core, then it is suggested that you use production on the phone as well. What is the model/manufacturer of the device you have ARC installed on?
Yes, it had worked since ARC’s launch with the same core and same phone.
I first deleted the Test Flight version completely, and re-installed the production app. Was still experiencing the same spin.
I finally just waited and let it spin. I think being on the same WiFi as the core helped speed along the process, but it finally loaded up and began working again.
It took at least 5 minutes.
It’s a large library so potentially just had a lot to download.
Anyway, problem solved. ARC is working normally now.