umask randomly set to 111 on 4.1BSD VAX 780

[Margaret E. Craft]

Random login sessions are finding their umasks set to 111.
(Not all sessions for the affected users.)

Our system level CMASK is 077.

It is not a user-program doing it, since one case consisted
merely of logging in and typing "umask".  The .login and .cshrc
made no mention of umask.  

Oh -should've mentioned that all known sessions are running csh
as login shell.

Any ideas on what the problem is?
Any ideas on what I can look at?  I have a core file from terminated,
umkas=111 session, but don't know what to do with it...

HELP!!!

Thanks - Peggy Craft, Sys Prog for BCCVAX

Send mail to ...!linus!peg    or    peg at mitre-bedford