Tim:
I've uploaded some screenshots from my installation, here: http://imgur.com/a/f11EE
Bob Goodwin:
Similar but different, not as ornate, display. I have only two options, POP3 or IMAP, choose pop3, and a check box for SSL.
Okay, that's the initial set-up walk-through. What happens if you go into the preferences after the program is running? (That's where I got my screenshots from.) Do your settings exist in there? Can you configure things to work from there?
That may help to narrow down whether there's a bug with the initial configurator, general preferences, the program, or your ISP. I used to have trouble with Evolution's walk-through configuration, I'd set it to not require login to the SMTP server, and it'd always set it to require it. I always had to go into the preferences, after the walk-through, and change it.
And with my entries: https://imagebin.ca/v/2hwM3tHz8xhc which produce the "Invalid Command" error message when I "check" for mail.
I notice that there's a debugging option in my preferences, not sure where the output is, though. But it looks worth exploring.