Quicktime Playback is Pixelated

Hi,
I have a client on a 1.67 PB 17" send me a quicktime file the other day that was extremely pixelated. This is a reel that they have done from one of their advertising companies.
I played the original file back from the website, and it played fine.
I had her try to playback some movie trailers from apple.com/quicktime, and they played fine on her machine as well.
Trying to figure out why she'd be getting this poor quality when doing playback. Other quicktime movies on her machine do not have this problem.
She is running the latest version of Quicktime.
Any ideas?
Thanks!

This part had me confused:
"I have a client on a 1.67 PB 17" send me a quicktime file the other day that was extremely pixelated."
It made me think that you had a client send you a file that was extremely pixelated. If the only combination that is causing a problem is that particular movie when viewed on your client's computer and online, and any other movies play fine on her computer, and the problem file plays fine on your computer, I would double check what she means by pixelated.
Does the file play ok for her when it's local and in QuickTime Player? If it does it makes me wonder if the issue is that the movie is breaking up due to a bad Internet connection. That wouldn't be pixelated, but it would be fairly broken up.
What is the data rate of the movie?

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