Blank page on login/register

That's definitely strange. Sometimes, servers can prevent errors from displaying, regardless of whether you've enabled Error Reporting in Joomla.

Can you please let us know the following:
* Post (or private message us) the url of the page you're testing with
* Also, please let us know the URL that's generating the white page (just in case we can't see it)
* Finally, do you have any SEF components or Joomla's core SEF enabled?

Thanks, and we'll help you get to the bottom of it!

JuJ,
Whew.. took a bit, but we think we found the issue with the login link. We need to run this through our automated tests (to make sure it doesn't break non-sh404 or other unforseen problems, so we don't have a release available with the fix. If you want to test though, it's a simple one-line change and that will hopefully get you set up.

In the /components/com_jfbconnect/libraries/facebook.php file, on line 95, you'll see the definition for $loginLink = ... Replace that line with:
Please let us know if that fixes you up, we'd love to hear confirmation. We'll be releasing 3.2.1 later this week, and this change will be included as well as a few other fixes for minor issues (though this is one of the bigger ones).

Thanks for your patience, and good luck!

JuJ,
The Confirmation FB page only appears once. Once the user approves the application, they won't have to approve it again, so that's normal. Obviously, the white error page is not.

Is it possible to Private Message me super administrator credentials to try to figure out what's going wrong on your site? We'd like to get this fixed asap to have the fix in our 3.2.1 release.

Thanks!

Yup, once a user approves your application, they don't have to do it on any other returning visits (unless they delete the application from their account on facebook.com).

Thanks for the PM. Will look into this very soon.

JuJ,
We're hard-pressed to figure out the cause of the problem. We've tried changing the configuration of quite a few items without any luck. The updated change you did is implemented correctly and works as expected on a few of our tests sites. The only thing we see really different is the version of sh404 you're using, which is over 6 months old. There's been numerous fixes for compatibility issues that sh404 had in the early days of it's version 2 release, and all we can figure/hope is that if you upgrade to the newer version, the problem will be resolved.

The URL that's failing is Facebook's return of the user to your site with the authentication cookie stating that they successfully approved your application. If we disable sh404, everything happens like normal. Enabling it seems to be preventing JFBConnect from reading the authentication cookie and logging the user in, obviously necessary steps in the process.

Please update sh404, and if you continue to have issues, let us know, and we'll be able to try some more things using the newer release.

Thanks,
Alex