IMovie temporary files; importing fails on network home directory

Hi all,
I work in a laboratory and manage a bunch of Macs. We have a 2x2.5GHZ G5 with 4G of memory and iMovie 6. The mac has two 300 GB disks that are in a concatenated raid group, so the system has about 450GB of free disk.
The mac is bound to an Open Directory server and users have network home directories. (The network file system happens to be AFS, which is probably unusual)
The problem I am having is that whenever I am importing a clip from any external source (in this case I have tried a Sony GL-2 and an external DV deck), after about 13 minutes of importing, imovie stops importing, and iMovie displays the blue screen that you get when a video source is connected but not playing... but, the camera is clearly still playing, if I look in the viewfinder. this failure mode is completely reproducible, and always fails at the exact same place. (but works fine on another mac, see below)
I have tried saving the iMovie project onto both local disk and into the networked home directory, with the same results in either case.
I've tried the same setup on an identical mac that is not using networked home directories (local only), which works fine. I suspect that the problem has to do with the way the network file system caches/buffers, but I have no idea where iMovie keeps its housekeeping/temporary files. I was under the impression that it is all kept in the project directory, wherever you happen to create it. Are there some files that get written to the home directory no matter where you save the project?
mjp
2x 2.5 GHz G5 PowerMac 4GB RAM Mac OS X (10.4.6)

iMovie doesn't have temporary files. All files are kept in the project folder (or "package").
iMovie: How to Save Projects to Another Hard Disk
http://docs.info.apple.com/article.html?artnum=93296
See "Important Considerations" at the bottom.

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