Hi @James_England,
Thank you for the report.
We are tracking what appears to be a rare but ongoing instance of this fatal error. Are you also able to elaborate on the following?
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Open Activity Monitor and see if there are Roon-related processes still following. If so, what happens if you terminate them? Does Roon launch properly on the next attempt?
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Navigate to your Mac’s .tmp folder (Go → /tmp) and clear any .lck file associated with Roon.
We’ll let you know as we learn more. Thanks!