.MOV Files playing on some machines not others

Ok, so this morinig we are having an issue win which a file that will play on two of our macs will not play on any others via QT. When I open with QT X, I get a dialogue suggesting the file is corrupt, when I open with QT7 I recieve the old "An invalid public movie atom was found in the movie". On this machine, I can open these files via VLC and Handbrake, but not QT. We have two other machines that can play them fine in QT, so I thought it was a missing codec issue. Comparing the Quicktime folders from both root->Library and root->Syatem->Library show that I have all of the same codecs installed, so that cannot be the issue.
The files in question are from a Firestore capture drive, and have a .mov extension.
Any help appreciated,
-Will

I'm having the same problem. It must because of a recent QuickTime update. I suspect the iTunes 10.5 update is the culprit. I shoot with a FireStore (FS-C) and have 5 Macs that can no longer read any of the .mov files. All the Macs (MacBook,Pro 8,3 / MacBookPro 8,2 / MacBookPro 5,2 / MacBookPro 2,2 / MacMini 4,1) are running 10.6.8 and all were capable of reading the FireStore files...until very recently. The last footage I edited was on October 9th. Somewhere between then and today (October 25th), an Apple update made the .mov files unopenable. When I try to play the files in Final Cut Pro (7.0.3), I get a "General Error" message.
I've installed VLC and the files will all play properly in the VLC player, so the files themselves are intact.
UPDATE: Yes, the problem stems from a recent QuickTime update. This has been confirmed in the following support notice from VITEC:
http://www.focusinfo.com/dynassets/documents/downloads/MACOSX_Supp_Anncmt_10.21. 11.pdf
I'm going to try downgrading my installed QuickTime and I'll post the results.
MattLTH

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