Fatal error: Using $this when not in object context in ...

Have't heard of that error before. Can you let me know a few things:
* You mention JFBCLogin. You should be using the SCLogin module. If you are really using the JFBCLogin module, you should upgrade. JFBCLogin is very old and was replaced by SCLogin over a year ago.
* Disabling the JFBConnect authentication plugin may fix the issue, but that's not a solution. Facebook login's wouldn't work anymore with that plugin disabled.
* Can you tell me what other plugins are enabled from the following groups:
- Authentication
- User
- socialprofiles
- jfbcprofiles

Finally, let us know what version of PHP and Joomla (2.5.8?) you are using.

Sorry for all the questions, but we'll need more information to get to the bottom of things.

Thanks,
Alex

Joerg,
If you could provide super admin access, that'd be very helpful. To do so, please Private Message them to me by clicking the arrow under my picture (<

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) and hitting the mail icon.

Thanks,
Alex