title: On my Magento store I cannot login on the frontend and cannot add items to my shopping cart after upgrading to 1.4.2. Any ideas what's wrong
body: <p>I have just upgraded my Magento shopping cart to 1.4.2. Since the upgrade when I try to login on the frontend the page refreshes, but there's no evidence of being logged in. If I try to login with the wrong credentials I get an error message. I figured that it might be a session problem so I tried adding an item to my cart. When I do that I get an error message that says, "Cannot add the item to shopping cart." This might be an unrelated problem. Was wondering if anyone has any ideas where to look. Adding an item to the shopping cart adds the following line to the log:</p>
  
  <pre><code>DEBUG (7): Exception message: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'additional_table.is_visible_on_front' in 'field list'
  </code></pre>
  
  <p>Trace: #0 /var/www/magentobase/lib/Zend/Db/Statement.php(300): Zend_Db_Statement_Pdo->_execute(Array)</p>
  
  <p>Logging in produces no errors. </p>
  
  <p>Thanks for looking!</p>