Joshua: I've sometimes found irritations like that - of course, if the problem showed up in the dev environment, the code would never have gone out like that in the first place! I had a very frustrating time once, getting a BugCheck when I called NtClose. Needless to say, an AV app (not the one you mention) had hooked NtCreateFile and NtClose; their close hook seemed to be relying on some internal state being set up by their open hook, which wasn't happening in the particular way I was using it. Very irritating!
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