Hi @tom_wobbekind ----- Thank you for the report and my apologies for the troubles here.
Moving forward, may I very kindly ask you to please provide/verify the following information for me:
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An expanded description of your current setup as seen here.
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Please verify if you have any active firewalls or antivirus applications currently active in your setup.
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If you open the “activity monitor” when the application is closed are you seeing the RAATServer process still running?
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As a test, may I kindly ask you to please “restart” the the device hosting your Roon core, being sure to leave “Reopen windows when logging back in” unchecked when performing this test (example of what the window looks like below).
Once the computer comes back online please confirm that the devices are no longer visible in Roon.
-Eric