can not login

Scott,
I'm not sure what would be causing that. It could be quite a few configuration issues or the version of JFBConnect you're using. Can you tell me what version of JFBConnect you have installed? Also, can you tell me if you're using any 3rd party profile integration for things like Community Builder, JomSocial, Kunena, etc?

Also, please post from the account you subscribed to JFBConnect from. Priority support is for active subscribers only.

Thanks,
Alex

The error message "jfbconnectauthfailure Username and password do not match or you do not have an account yet." isn't related. That error comes up whenever any user plugin can't authenticate the user, but the beginning part (jfbconnectauthfailure) just means you have the JFBConnect authentication plugin ordered last. If you ordered it first, the error would appear with a different authentication plugin. It's not helpful and pretty annoying.

I just registered on your site through Facebook and then logged out and in multiple times with both my Joomla and Facebook credentials. Each time I was logged in as expected. I'm not sure what's happening on your site. If you can't log in using your Joomla credentials, that means it's something outside of JFBConnect that's causing the problem. We don't alter the normal Joomla login process, so that wouldn't be an issue caused by our extension.

I'd keep testing and disable any caching you have enabled or any of those plugins you mention above and keep testing. If you can narrow down which plugin or extension is preventing the login process, we may be able to help you from there.

I hope that helps get you started,
Alex