Lol a mi me ha tirado el admin....
Mage registry key "_singleton/customgrid/observer" already exists
Trace:
#0 /home/esportle/public_html/app/Mage.php(222): Mage::throwException('Mage registry k...')
#1 /home/esportle/public_html/app/Mage.php(476): Mage::register('_singleton/cust...', false)
#2 /home/esportle/public_html/includes/src/__default.php(21023): Mage::getSingleton('customgrid/obse...')
#3 /home/esportle/public_html/app/Mage.php(447): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#4 /home/esportle/public_html/includes/src/__default.php(13465): Mage::dispatchEvent('controller_acti...', Array)
#5 /home/esportle/public_html/includes/src/__default.php(13422): Mage_Core_Controller_Varien_Action->loadLayoutUpdates()
#6 /home/esportle/public_html/includes/src/Mage_Adminhtml_Controller_Action.php(275): Mage_Core_Controller_Varien_Action->loadLayout(NULL, true, true)
#7 /home/esportle/public_html/app/code/core/Mage/Adminhtml/controllers/DashboardController.php(40): Mage_Adminhtml_Controller_Action->loadLayout()
#8 /home/esportle/public_html/includes/src/__default.php(13582): Mage_Adminhtml_DashboardController->indexAction()
#9 /home/esportle/public_html/includes/src/__default.php(17927): Mage_Core_Controller_Varien_Action->dispatch('index')
#10 /home/esportle/public_html/includes/src/__default.php(17484): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#11 /home/esportle/public_html/includes/src/__default.php(20061): Mage_Core_Controller_Varien_Front->dispatch()
#12 /home/esportle/public_html/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#13 /home/esportle/public_html/index.php(88): Mage::run('', 'store')
#14 {main}