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.
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About Aperture SlideShow Support Update 1.1
This update addresses an issue affecting the playback of HD video clips used in Aperture 3 slideshows on Snow Leopard. Audio and video tracks now remain properly synced in video clips that have been trimmed. The update is recommended for all users of Aperture 3.