I've tried to login with Butler several times.  Each time it gives me a different authentication code.  Each time, after I enter the authentication code and hit Enter, Butler freezes.  It doesn't say the authentication code was right and it doesn't say the authentication code was wrong.  No error messages, nothing.  I paste the code, hit enter, and it just sits there.

Any ideas how to get it working?

Also, why is it the same code every time?  I thought this was some kinda one-time pad thing.

I replied to the equivalent support ticket.

butler wasn't freezing, it was waiting for an URL (not just the API key) or an HTTP request from the in-browser Authentication flow, but WarpZone has NoScript installed so the automatic method wasn't allowed to work :)

I'd just like to say thank you for answering it here even though you already answered me personally in the email.  This will help everyone who randomly stumbles here via Google at some unknown point in the future.