Apple has released Aperture 3.2.4 an update of its software for pro photographers. It requires Mac OS X 10.6.8 and is a 635.54MD download.
Aperture 3.2.4 Aperture 3.2.4 improves stability on Mac OS X Snow Leopard. It also addresses an issue that could prevent the Viewer from updating correctly after editing a photo using an external editor. You can obtain the update via the Software Updates component of the Mac OS X Systems Preferences app.