title: CakePHP 2.1 $this->Session->write is not working
body: <p>I included the 'Session' Component and the helper in my AppController.php
  Now, if I use <code>$this-&gt;Session-&gt;write('App.testString', 'test);</code> the Session is not created, or at least I don't receive the string when I do <code>echo $this-&gt;Session-&gt;read('App.testString');</code>.</p>
  
  <p>Do I have to change any settings for Sessions to work?</p>
  
  <hr>
  
  <p>Inside a controller function I can write and read a session, but if I want to read the session inside a different function (of the same controller) I don't get a value back.</p>