Icon preview not working properly

I have a folder with mp4 files, where they all have preview icons except one file. All the files were created and saved the same way and the folder in Leopard is set to show previews so I don't know why that 1 file should be any different. I've repaired permissions but no fix yet.
Any suggestions please??

I'm experiencing the same thing but with all kinds of files that have shown a preview in snow leopard: pictures, PDF-documents, music (with album art). It seems that previews are not created automatically whenever I change the name of a file or edit it in any other way, the preview shows up instantly. Rebooting works, too.
This is really annoying and a little online search shows, several people are having the same problem. As far as I know, there's no fix yet.

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