The only setting that you should need is the Post Attribution setting. I'm not sure of any other setting that would cause the problem you're having.
Please make sure that you are logged into Facebook.com and go to the Settings area for the Page with the same user that you are using on your site in JFBConnect. The Post Attribution setting is per admin user for the Page, so some admins may post as the Page and others may post as themselves.
Please double-check, but if that doesn't help, let us know, and we'll see what more we can do.
Thanks,
Alex