Facebook Ignited Infinite Loop Problem

[eluser]programmieraffe[/eluser]
Hey Codeigniter-Folks,

I have a problem using the facebook-ignited package.

Webserver:
MAMP + OSX 10.6.7 / PHP: 5.2.13
( access via "local domain" [etc/hosts - local.mydomain.de, virtual host in MAMP/apache] )

Codeigniter Reactor: 2.0.2
CIBonfire: 1.0.1
Facebook-Ignited: 1.0.4


config/fb_ignited.php:

Code:

config/fb_ignited.php
$config['fb_appid']        = 'XXXXXX6';
$config['fb_secret']    = 'XXXXXX';
$config['fb_cookie']    = true;
$config['fb_canvas']    = '';
$config['fb_auth']        = '';

controller:

Code:

class welcomeFacebook extends Front_Controller{

function getMe(){
                
        // The fb_ignited library is already auto-loaded so call the user and app.
                $this->load->library('fb_ignited');
        $this->fb_me = $this->fb_ignited->fb_get_me(false);    
            
        if (isset($this->request_result))
        {
            $content_data['error'] = $this->request_result;
        }
        $content_data['me'] = $this->fb_me;
        $content_data['fb_app'] = $this->fb_app;
        $this->load->view('welcome_message_fbignited', $content_data); // the default facebook_ignited view template
            
        }
}

The result is an infinite Loop with Chrome and Safari, both when logged in at facebook already or not...

Code:

oauth (www.facebook/com/dialog) 302 Found
uiserver.php (www.facebook.com/connect) 302 Found
/welcomeFacebook/getMe/?code=[….]&state;=[….]
oauth (www.facebook/com/dialog) 302 Found
...

fb_get_me() (Fb_ignited) fails permanently, because $this->CI->facebook->getUser() does not return a user, so it redirects over and over again. I figured out, that there is no signed request. And that getUserFromAvailableData() (base_facebook.php) fails to get user data.

The app-id and app_secret are fine, because i tested it with the javascript-sdk and it all worked well.

How can i debug this? Is there a debug option for php-sdk / facebook-ignited?
Or is it a codeigniter-cookie/session related problem? (Or is it something else? )

Thanks in advance for your help!
Matthias