When you are editing the robots.txt file make sure you are uploading the new one by saving it and either manually dragging it into the folder or if you are using filezilla once you save it if you click back over to filezilla from the text editor it should ask to upload the saved file.
Also be sure to clear you cache/history in the web browser.
Thanks for the tips.
When I download the robots.txt again, from Cyberduck, my updates are there.
But when I open my site/robots.txt (even different browser, anonymous tab), I still see the old one:
User-Agent: * Disallow: