I just installed Opera, and am having no issues with the site, coming in at
ninjette.org or
www.ninjette.org.
What version are you using?
This page lists the browsers that this cert is supposed to be compatible with:
http://support.godaddy.com/help/arti...ompatible-with
It's possible that you're just missing a root certificate. It should be in all recent versions of all major browsers, but if for some reason it isn't, you can download it from that Repository link at the bottom of that godaddy page, and just install the top root cert into your browser.