Cannot create imaging session in server object

On one of our servers, I am not able to create a multicast imaging session
in the server object. When I go into the server object and try to create a
session, I get an Error -601 message, "The object name entered could not be
found in the context specified..."

The server is running NW65SP5 with ZDM 701. I have changed this server from
having a RW replica of its partition to being the master, run numerous DS
repairs, reinstalled ZDM with the top-level admin user in our tree, deleted
any phantom imaging session objects, updated the Novell Client on my
workstation, tried multiple workstations, etc.

Any ideas?

Rick P