title: Magento sessions not working on server, but work on localhost
body: <p>In my Observer.php I am storing a variable in the session</p>
  
  <pre><code>  $itemAddedToCart = 'true';
    Mage::getSingleton('core/session')-&gt;setItemAddedToCart($itemAddedToCart);
  </code></pre>
  
  <p>When I try to retrieve it:</p>
  
  <pre><code>Mage::getSingleton('core/session')-&gt;getItemAddedToCart();
  </code></pre>
  
  <p>It is always NULL.
  The weird thing is it works fine in my local dev environment (MAMP).  Why isn't it working on a server?  Tried on both Dreamhost and a Magento Hosting company.</p>
  
  <p>Thanks in advance!</p>