Apple has released Aperture SlideShow Support Update 1.0 to fix an issue with Aperture 3's integration of video clips in slideshows.

Aperture SlideShow Support Update 1.0

This update addresses an issue affecting the playback of video clips used in Aperture 3 slideshows on Snow Leopard. The update is recommended for all users of Aperture 3.

This update weighs in at 62.3 MB and requires Mac OS X 10.6.2

Download Link: Aperture SlideShow Support Update 1.0