umask problem

Hi Managers

I have a user who has the line:

umask 27

in his .cshrc.  However, when he types umask, he gets 77.  Is there any 
system setting that could be over-riding the umask instruction in the 
.cshrc?  Once in his shell, he can adjust umask manually by typing "umask 
27".  There are no other umask setting in his .login.  He's logging in from 
a Mac OS X.

There are a few similar questions in the archive, but they all turn out to 
be FTP problems or ACL problems.  Mine isn't as I have:

# sysconfig -q sec acl_mode
sec:
acl_mode = disable

All suggestions as always, gratefully appreciated

Cheers
Derek