Login with Facebook and without Facebook

Holger,
We saw this on one other site, and I'm not sure what's causing it. In the login form, Joomla requires a special 'token' value for each user to prevent some security issues. On the other site (and I'm assuming yours) the token wasn't being properly set.

To fix on that site, we asked them to disable the System - Cache plugin, and it seemed to work. I'd ask you to do the same, if enabled, or any of the following:
* Disable Caching in the SCLogin module (change from Global to 'off')
* Disable the System - Cache plugin
* Disable Caching in the Global Configuration area of Joomla
That goes from least drastic to most drastic, so hopefully the first will fix the issue. Let us know which step it takes to fix your problem and that will help us investigate further.

Thanks,
Alex