Finder cannot preview prores files.

I just purchased a new iMac with Lion 10.7.2.
In Snow Leopard (on an older machine) I was able to preview prores files directly in finder by pressing spacebar. With Lion, finder just keeps searching for a solution and never finds one. I can see the files if I open them in Quicktime, but having at least a thumbnail would save a lot of time.

The problem isn't the file's icon, which is clearly visible (in this case a Quicktime movie icon), it's the ability to view it by pressing the spacebar while in the Finder (what is commonly referred to as "Quick Look" - same as in Mail).
This problem only occurs with ProRes files; all other Quicktime formats Quick Look in the Finder just fine. ProRes used to as well in Snow Leopard and all previous versions of OS X, it's only since upgrading to Lion that this no longer works.
It's worth adding that the ProRes Quicktime component is still in the Quicktime folder in the Library, and ProRes files still open in Quicktime 7, Quicktime X, Final Cut Pro Studio 3, and iTunes.
Any thoughts?
Thanks,
Max

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