Another user experienced a similar issue when running Windows 1903 (a.k.a 10.0.18362). For him, the app crashed when using Import->Local File, so it might not be exactly the same. After updating to Windows 10 version 1909, the issue went away. You can consider going to https://www.microsoft.com/en-us/software.../windows10, clicking "Update Now" and then updating to version 1909. If that is not the issue, I'm going to need to see an example of one of the text files you are importing.
Thanks,
Mike
Thanks,
Mike