ITunes mutilated my video files

I had a serious issue when I tried to tag several movie files as "TV Show". iTunes kept spinning while the Info/Tagging window was open, and when I eventually cancelled its attempt, I found out that it had somehow destroyed the original files.
They were there, but they would no longer play in iTunes, AND IT WAS NO LONGER PLAYABLE anywhere on my computer, or re-convertible. I don't know what iTunes did to those videos, but it mutilated them.
Luckily I had the "originals" - eg the versions that weren't initially ipod compatible (such as .avi and .flvs and stuff) so I just ran them all through VisualHub again, after deleting the mutilated files. That was annoying because it takes quite a bit of time to do nice 2-pass H.264 conversions even on a MacBook Pro.
The second time I (a) did not attempt to tag the files, and (b) made duplicates of them onto another drive as a back-up. So far things are fine, but it's annoying not being able to organise my movies more efficiently. Especially as video playlists don't seem to load on the iPod Touch - AND, as the Apple Help notes - there is currently a bug with video Smart Playlists not working at all (they won't save).
Love my iPod, but its software/OS has some way to go. Roll on Februrary

Well the other person has witnessed this behaviour - in that it took several minutes.
I cannot see how it could NOT have been iTunes (coupled with my cancelling its tagging process early) that mutilated my files. What else could have done it? All the other movie files, that I did not attempt to tag, or that I tagged as Music Videos, were fine. All these files were identical in their codecs and conversion parameters.
I have managed to repeat the error today, with a test file. The file goes to TV Shows, but is not playable. Trying to play it outside iTunes with QuickTime generates the error:
"The movie could not be opened.
"An invalid public movie atom was found in the movie."
Trying to open it with software such as MPEG Streamclip (which will sometimes even open damaged files), gives the error:
"Unrecognised file type: open anyway?"
When I click yes, it opens it, and gives:
"File open error: can't find video or audio tracks."
So I think we can confirm that (1) the file is mutilated and (2) iTunes did this during the "writing tags" tagging process, which I terminated early. I would be interested to know what goes on within a movie file during tagging that could affect the main file content data in this way.

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