Thinking about upgrading and optimizing Magento? Think again if you have plenty of extensions installed and later on, you want to get rid of some of them, especially when they are payment methods. I don't know if it's Magento's fault or some extensions are poorly written, but believe me, some errors can drive you nuts when you don't know where to start debugging.
After a Drupal upgrade, I got this: Fatal error: Call to undefined function drupal_check_memory_limit() in full_path/modules/system/system.install on line 206.This is mainly because the update was incomplete. You should update includes directory as well, after updating the core module files.However,...
