Can you please provide the following details that might help in making progress on this bug report:
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Is this crash reproducible using the latest version Mp3tag v3.14a?
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If it crashes, does it ask you to save a crash dump? If so, please do so and send it. If not, please send
%APPDATA%\Mp3tagError.login the version right after it crashed. -
Please send a screenshot of the error message that reports missing permissions.