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You may want to try disabling layer cache and purging every (1) frame during render via the "secret" prefs.
To access the secret prefs, hold down shift while navigating to the preferences. Release shift when the dialog box appears, and go to the end of the preferences section.
In addition, make sure to get any updates for Keylight from The Foundry's website. There was a hotfix release shortly after CS4 came out that may solve your particular crash problem, 1.26 or so.
Excellent! That seems to have helped. I did a couple of quick tests to see if that would work. Although I still can't figure out why it would do that with only DV source with a mask and keylight. I did notice the RAM shot up quickly to 59% of 2 GB used, but after doing what you said it only goes up to 18%. Secret preferences... hmm.
I'll check for an update to Keylight as well. I had checked the Foundry web site briefly, but didn't find much.