Help!! video clips won't play in slide show

I have a 40 minute Aperture slide show presentation that contains a few video clips (time-lapse videos, etc). It played well last summer. However, now that I am about to present the show tomorrow I can't get the video clips in the show to play. They have all been located and connected to the original files. If I double click on individual video clips they will play in the browser window but they won't play in my slide show. Any ideas? I'm in panic mode!
Aperture 3.4.5.

What happened since last yoear? Have you reinstalled the system at some point? Maybe you had last year additional video codecs installed? Flip4Mac, Perian?
Do your videos play in QuickTime Player, when your export them to the DeskTop?
Are your videos iPhone videos? In that case you may have a problem with
Also, if you recently run a cleaner utility that cleared the caches, you now may have a missing  com.apple.xpchelper.cache in /System/Library/Caches .
This has been known to cause videos from stopping to play. This file will only be recreated by reinstalling MacOS X, but you can force its recreation by a Terminal command.  See:
Re: Library doesn't play MOV-files on one computer, no problems on another.
Regards
Léonie

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