OS X Mavericks: Installer doesn’t accept blank admin password When attempting to install OS X Mavericks, a blank admin password is not accepted; you may be repeatedly prompted to enter your password.
About the security content of Safari 5.1.10 This document describes the security content of Safari 5.1.10.
iTunes in the Cloud: Purchases may display incorrect information or play back incorrect content In some cases, when you view the following types of content using iTunes in the Cloud, iTunes 11 may display incorrect information or may play back incorrect content: Music Movies TV shows