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For me, this was one of the most useful add-ons in Thunderbird, and I used it a lot. Suddenly, and recently, it has completely ceased to work i.e. I can select any of the options, but nothing happens and nothing is written to my dump folders.
A great pity, and no obvious reason for it.

P
Sorry for the issues. Can you open an issue in the repository:
https://github.com/thundernest/import-export-tools-ng/issues
Please include OS and Thunderbird/Extension versions.
also include any debug output
Thanks
Christopher