I'm currently on a MAMP install on my local machine testing a facebook application. I suspect it is probably my MAMP configuration.
In cake php in /user/login I set a session using
$this->Session->write('Facebook.last_name',$user_profile['last_name']);
$this->redirect('/users/add');
then in /users/add I try and access all session informtaion
print_r ($this->Session->read());
However the only session information that is returned is the following and not what I set.
Array ( [Config] => Array ( [userAgent] => 87a1f39ea78f3ab90174ff791710e6dc [time] => 1345915176 [countdown] => 10 ))