Thank you very much for reaching out, and we’re sorry for the trouble.
We haven’t received any similar reports so far, so this may be a bug. If possible, could you export the affected database and share it with us privately for investigation? Please avoid posting any sensitive data publicly.
Alternatively, could you send us a screen recording showing the issue, along with a detailed description of the steps—from upgrading to MarginNote 5 to launching it and encountering the authorization prompt? Please also include your macOS version and the exact MarginNote 5 version you’re using.
These details will help us identify the cause. Thank you for your help!