[Plugin: Social Connect] Facebook not redirecting properly after callback

First of all, awesome plugin. Just what i need, thanks for the effort.

Creating a user via Facebook does not work.

– the Facebook popup opens – I can authorize the app
– my app shows up under my Facebook Apps when I log into facebook.com
– no WP error message
– the access.log shows “GET /wp-content/plugins/social-connect/facebook/callback.php?code=AQAqACUF38mY…..”

But on WP get simply redirected to the same page, but nothing changed.

How can I debug / find out more about what’s going wrong.

I assume it’s somewhere in facebook/callback.php?

My testing site is http://clickkiller.com Google Login works fine

I tried getting it to work by looking at these threads

http://wordpress.org/support/topic/if-you-are-having-problems-with-connecting-to-facebook?replies=16

>> I think this should be fixed in the version 0.9 I installed from WP no?

http://wordpress.org/support/topic/plugin-social-connect-facebook-connect-error?replies=11

>> I inserted the callback URL in facebook.com “http://clickkiller.com”

http://wordpress.org/extend/plugins/social-connect/