Thanks to all who responded over my udc problem.
I can see where the problem is - while the account has
        READ    :ANY
        WRITE   :AC
        APPEND  :AC
        LOCK    :ANY
        EXECUTE :ANY
The group gen.sys is set up as GU for all.  OK this means that no user is
going to be able to access the UDC if security is on.  I just can't see how
users were able to access it before unless VESOFT SECURITY/3000 has some way
of allowing access to the file.  I will re-read the VESOFT manual again.

I will change access to the group and to the udc to give lock and execute
privilege to the users so I can resecure the udc.

thanks  ...  Terry
Signature:
     Terry Prime
     Client Services Officer
     Queensland University of Technology
     phone: (07)38641784   fax (07)38641343
     Internet:[log in to unmask]

Disclaimer:
     What i have said is my opinion and does not reflect the
     opinion of my employer or co-workers