Apple has updated the Mac OS X 10.6.3 Combo Updater to version v1.1.  Unfortunately Apple hasn’t disclosed what has changed, but from what I can piece together this addresses issues with updating directly from Mac OS X 10.6.0 to Mac OS X 10.6.3.  Regardless, as with all combo updaters, it does not hurt anything to reapply the Mac OS X 10.6.3 v1.1 Combo Updater on top of Mac OS X 10.6.3 if you are experiencing any odd problems after… especially if you updated from Mac OS X 10.6.0 prior to the release of this new v1.1 combo updater. http://support.apple.com/kb/dl1017