kid3-CLI 3.8.0 on windows 10 does ... nothing

Hi there, I've been using 3.3.2 in a script for a few years and just downloaded 3.8.0. Everything I try, get genre 2, set artist ..., etc just returns me to the command prompt without touching the file. These commands work fine on 3.3.2 (other than complaining that windows 10 is untested OS). I'm thinking I'm doing something wrong, but I've tried everything I could think of. The program starts OK, I can get it to complain of file not found or invalid command. Any ideas?

Imported from SourceForge, author: wfdecamp