Recover missing old Photo Booth pictures after upgrading to version 4.0 library storage in Mac OS X Lion
No worries, all your old pictures are still there, but only do not show up in the filmstrip view.
You can easily right-click the library in your “Pictures” folder and browse the package’s contents. Inside another folder named “Pictures” everything is still in place.
Either move your old files with the deprecated file naming scheme out of the library to another directory of your choice or follow the link above to migrate the files automatically.