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Subject: Re: negative group permissions?
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jb <jb.1234abcd <at> gmail.com> writes:

> ... 
> I would suggest (if you can) that you change the .seq permissions to 0664 and
> watch what happens to it - the purpose is to narrow down who/what changed its
> mode.
> Some history. logs. and some ad hoc "watch script" would do it.

Take a look at "notify" feature (file, dir, event).
http://www.freebsd.org/cgi/ports.cgi?query=notify&stype=all
jb