Hello Sebastian,
could you try to create a debug log for me? A debug log contains detailed information about what happens within Boxcryptor so that we are able investigate your issue.
You can find instructions on how to create a debug log by following this link:
https://support.boxcryptor.com/display/BCWINEN/How+to+create+a+Debug+log
Or in German:
https://support.boxcryptor.com/display/BCWINDE/Erstellung+Debug+Log
Please note that the debug log may contain sensitive information (e.g. filenames) - however, it will never contain file content. Please send the report to support@boxcryptor.com.
Best regards,
Christian