Last month(May 2015), eBay Enterprise released newest version of Magento Community edition (version 1.9.1.1). It’s always a good idea to upgrade your store to the latest editions in order to keep away from security risks and enjoy the new features. We all must want to upgrade our Magento Stores to the latest version 1.9.1.1. However, some of us might not get success due to some errors/issues occurred during upgrade process. 1. Blank System Configuration Page:After upgrade, some users might get a blank page on System Configuration page in the admin panel.To solve this issue, all you need to do is to remove all the files except config.xml from /app/code/core/Mage/GoogleCheckout/etc.