Backup before updating to mountain lion
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Granted the refresh of OS software may in fact clear some of these problems up, but it may be more assuring to install the new OS over a known working system configuration.
But before you do anything else, a word of caution: once you've used the OS X installer, it will automatically delete the file you need to make the backup disk, so you'll want to either make a copy of the installer or create your disk before you upgrade.
Backup before updating to mountain lion comments