Regarding Registration

We haven't heard of that error message before in the SCLogin module. If you could post the full error, including the file name and line number, that would help. You can remove any path information specific to your site.

With that said, the message is a strict standards warning, which is more like a mis-spelling error instead of a real error and likely won't cause any functional issues. Normally those messages shouldn't be shown on production sites. To hide those types of messages, you can go into the Joomla -> Global Configuration area and set the "Error Reporting" option to 'None'. Then, the message should not show anymore.

I hope that helps,
Alex

What specific version of Joomla are you using? The declaration of JFormField for me doesn't have the & on the $element. It's possible something changed in a newer version of Joomla (or if you're using a really old Joomla...)

In that file around line 125, can you try replacingwith
-Melissa

I'm assuming/hoping that your version of Joomla is incorrect. 2.5.6 is more the *3 years* old and has multiple known vulnerabilities in it. The latest 2.5 release is 2.5.28. There have been a huge amount of changes and bug-fixes in the 22 releases between 2.5.6 and 2.5.28. If you're running into issues, the first thing I'd have to recommend is upgrading. If you already are on 2.5.28, let us know, and we can help investigate further.

If login issues started when SCLogin module was installed, I'd recommend uninstalling the module and testing again. There's no permanent modifications that SCLogin makes, so removing it would remove any issues that SCLogin introduced. Then, try installing again to see if the problems return. That will help us narrow things down as well.

Thanks,
Alex