title: Magento 1.9.1 Cron Not Running
body: <p>I am having big issues with the cron of Magento 1.9.1 hoping someone can help. I have AOE installed and see not heartbeat.</p>
  
  <p>I have added my cron job</p>
  
  <pre><code>*/5 * * * * /bin/sh /var/sites/p/domain/public_html/cron.sh
  </code></pre>
  
  <p>But this still does not run, so I decided to try and try and run cron.php, this does nothing. This is my cron for this </p>
  
  <pre><code>*/5 * * * */usr/bin/wget -O /dev/null -o /dev/null http://www.domain.com/cron.php
  </code></pre>
  
  <p>Based on Magneto 1.8 cron.php I added the following to the cron.php.</p>
  
  <pre><code>$isShellDisabled = true;
  </code></pre>
  
  <p>Based on this still not working I tried the cron.php in the browser. I get an error in the browser that Printing is disabled by default for security reasons. </p>
  
  <p>So I changed my php.ini to memory_limit = 512M just incase. This is still not working.</p>
  
  <p>The error I get in my reports for this is:</p>
  
  <pre><code> a:5:{i:0;s:59:"Mage registry key "_singleton/cron/observer" already exists";i:1;s:537:"#0 /var/sites/p/domain.co.uk/public_html/app/Mage.php(223): Mage::throwException('Mage registry k...')
  #1 /var/sites/p/domain.co.uk/public_html/app/Mage.php(477): Mage::register('_singleton/cron...', false)
  #2 /var/sites/p/domain.co.uk/public_html/app/code/core/Mage/Core/Model/App.php(1316): Mage::getSingleton('cron/observer')
  #3 /var/sites/p/domain.co.uk/public_html/app/Mage.php(448): Mage_Core_Model_App-&gt;dispatchEvent('default', Array)
  #4 /var/sites/p/domain.co.uk/public_html/cron.php(74): Mage::dispatchEvent('default')
  #5 {main}";s:3:"url";s:9:"/cron.php";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:5:"admin";}
  </code></pre>
  
  <p>Any help would be really great.</p>
  
  <p>Note ** I have change the domain name to DOMAIN due to my site not being suitable for work.</p>