Before upgrading, make note of your third-party plug-ins. After installation is complete, reinstall third-party plug-ins as needed.
iPhoto '09 & iPhoto '11: Updating may disable some third-party plug-ins
If you are upgrading to iPhoto '09 or iPhoto '11 from a previous version of iPhoto with third-party plug-ins installed, these plug-ins may become disabled once the installation is complete.
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