I figured it out: turns out the machine was behaving like there was a
persistent cache because that's exactly what it had. Windows 7 Ultimate
has offline caching (sync center) that I never knew about and it is enabled
by default. Somehow, the quick temporary file write followed by rename
triggered a conflict event in the offline cache even though the share was
on line. Clearing the conflicts and disabling offline files resolved the
problem.
I saw the same behavior for Samba configured as both NT1 and SMB2. There
could still be a latent bug here -- I don't know whether it is limited to a
race in Adobe Illustrator and Windows or whether Samba is involved. I'm at
least happy that the answer rules out corruption of the file server.
-Michael
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