Apple has posted workaround instructions for a problem in upgrading to Aperture 3. The photo workflow software may quit unexpectedly on launch, or after entering an Aperture 3 upgrade serial number. The temporary solution is to move two files -- "Aperture System ID" and "ProAppsSystemID" -- out of the /Library/Application Support/ProApps directory on a Mac, and then launch Aperture to enter new and previous serial numbers. After the upgrade is authorized, the relocated files can be deleted.
