Quicktime playback sometimes does not play back Video

Recently upgraded to Snow leopard. Problem appeared after upgrade.
On some, not all, quicktime videos, the play back only has audio, no video. Quicktime ver. 7.6.3.
I have tried to upgrade to 7.6.4, but the installer won't let me, says I already have QT 10 installed. Even after I delete QT10, I still can't install it. I have reinstalled snow Leopard, and quicktime twice. Visited the genius bar, all with no luck.
Also have 3ivx MPEG-4 installed.
Any ideas? This is a problem because the videos of a tutorial DVD that I purchased only plays back some of the QT videos. The DVD works fine on an old PB G4.
Thanks

Open one of the non working files using QuickTime Player (Utilities folder) and then open the Movie Inspector window.
My guess is the files use Flash (.swf) tracks. QuickTime Player higher than 7.3.1 no longer plays Flash tracks.
You can't install 7.6.4 on Snow Leopard.

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Quicktime playback sometimes does not play back Video

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