We've just upgraded from Magento version 1.8.0.0 to 1.8.1.0 and now when we go to the configuration section of our site we receive the message:
Fatal error: Class 'Mage_Googlecheckout_Helper_Data' not found in /home/dir/public_html/guides/setup/app/Mage.php on line 547
Any ideas on what might be causing this