Apple's Mail Services Update 1.0 for Snow Leopard Server comes with brief release notes, stating only that it addresses "issues affecting overall mail service reliability and performance." Although Apple recommends the update for all users running Mac OS X Server 10.6.2, there have been reports of it causing problems, along with a possible solution outlined in an Apple Discussions thread. It's available via Software Update or the Apple Support Downloads page. Installation instructions for the update are available on Apple's Web site. (Free, 20.59 MB)
Undo in Game Your Video
While editing a video, if you have applied an effect that you want to remove, use the Undo option. To do this, just double-tap the portion of the video where you want to remove the applied effect. This patch will snap to the Timeline and a Cancel button will appear. Tap it to remove the effect.
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The following thread identifies others experiencing the same problem, with the same series of error message, and identifies a fix that should be better than reinstalling the 10.6.2 installer: http://discussions.apple.com/thread.jspa?threadID=2269047