facebook login giving blank page

Mark,
Ahh, yes. We actually had a similar post yesterday for a user that just upgraded. If you're using any sort of minification, caching or javascript combining extensions (also sometimes integrated into templates), that would have been the problem. The Javascript we use in JFBConnect v4.0 drastically changed to support the new OAuth2.0 protocol from Facebook. If your minification cache hadn't reset on it's own, it would have been serving the v3.x Javascript, which will throw the exact errors you mention above.

I'd recommend doing a Clean Cache in Joomla as well, and in any separate extensions you use for caching if they have the ability to clean their own cache.

Definitely hope you're all figured out now, but if not, let us know.

Huw,
Please let us know if the above helps you or if you're still running into issues after clearing cache, trying different browsers, etc.

Alex

Huw,
It looks like you're affected by the login bug I was mentioning above. We're working on a fix, and should be able to implement it on your site on Tuesday. It affects very few users, so very hard for us to debug. We'll definitely look forward to your feedback on the issue, and will let you know when it's fixed up.

One final thing you can try is deleting the application from that user's profile (not the Facebook application itself). You can do so by going to Account->Account Settings. Click Applications in the left. Then edit, and delete your application. This will make you re-grant permissions the next time you hit the Login With Facebook button, and may resolve the issue.

Sorry for the inconvenience, but we'll get you fixed up soon.

Thanks,
Alex

Huw,
If you're still having the issue with a specific user, yes, please send us the Facebook credentials for that user and leave the super admin account info you sent to us earlier intact (or send us new credentials).

We have some changes that should fix what's happening to that user, if it's what we think it is, but this is very very rare, so we can't recreate it ourselves.

Sorry for the troubles, but we'll hopefully get you fixed up soon.

Thanks,
Alex

Huw,
Got into your site, but couldn't log in with your Facebook account.. they wanted the answer to your secret question.

Anyways, I did the following things, which likely won't fix the problem, but will hopefully give more information to localize the issue:
1) We changed some code to re-arrange and perform a better check where we think the white page/PHP error was coming from - You hopefully won't get a blank page any more
2) We added multiple Joomla system messages for more status during the login process. Nothing should be intrusive/bad for real users on the site, but there are additional error messages now being output. When you try to login again, please let us know any of the red/blue system messages you get.
3) Your current front-end template was not showing system messages, so I added the following tag to your template directly above where the component is displayed. This lets the red/blue system messages show.. you may see more of them now as any extension, as well as Joomla, will use them for status messages:That shouldn't be a problem to have, and is normal, but you can remove it after you get the status messages for us.

Please let us know if this improves the situation or gives us more details to narrow things down,
Alex

Ahh.. that's actually a little different than I was expecting. I didn't see a user with the email address you specified, but one thing that might just fix you right up (with the minor changes I made), is enabling the "Automatically Link Facebook Users by Email:".

If not, we'll test again with your Facebook account, because, again, I'm not sure it's saying the email is already registered since I didn't see that user in the User Manager, but possibly I missed something.

Either way, we're narrowing in on the issue!

Alex