Hello together,
The crashes are caused by a recent update of Google Drive File Stream on Mac. Please download and install this experimental version which fixes these crashes. A stable update will be released as soon as possible.
https://www.dropbox.com/s/oyck36popqx7jr6/Boxcryptor_v2.26.957_Installer.dmg?dl=0
On a side note: If there is ever a problem that a native Boxcryptor application crashes / does not work for whatever reason, you can use Boxcryptor Portable to access your encrypted files. Boxcryptor Portable does not require an installation (and also uses a different technology stack as the native clients) - so chances are very high that Boxcryptor Portable works even if the regular installation does not. You can download Boxcryptor Portable here:
https://www.boxcryptor.com/en/download/?platform=portable
Best regards,
Robert Freudenreich