Updating the mac system
You will need to perform one of the Refresh Library methods below.
They can be performed on the entire library, a particular Source, or an individual title.Repairing permissions has gained the undeserved status of a magic incantation that can fix anything; some recommend it as part of regular maintenance.While it can be a useful troubleshooting step, we do not regard it as part of regular maintenance: it will not hurt anything, but running it unnecessarily wastes time.For additional information on Repair Permissions, see the section "The Repair Disk Permissions function" of our "The Repair functions of Disk Utility: what's it all about? In general terms, prebinding is a process that enables applications to launch quickly and incorporate newly-installed fixes and changes, primarily at the system level.
Under Mac OS 10.4 Tiger® and later, changes in the operating system have eliminated the need to update prebinding, even for most troubleshooting purposes. This phase is considerably shorter under Mac OS X 10.4 and later as other improvements related to prebinding have enabled this phase to be limited to the prebinding of select, system-related frameworks.
The only routine maintenance steps we recommend are the following: Check for updates to third-party software you have installed.