Dunno. Take a look at http://www.cygwin.com/ml/cygwin/2004-03/msg00454.html; it's a bit vague, but it's a kind-of known problem. I think it could be to do with installing cygwin as a local user and maybe then joining the machine to a domain and becoming a domain user....?
I found this message, and tried "chgrp -h Users" on the directories that belong to None, but it didn't change anything. I re-installed from scratch and the "touch ls-R" trick alone worked. What is intriguing is that I seem to be the only one to have the problem.
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