I have experienced this twice with the same results, so I think this a

valid issue.

I uninstalled the ZCM agent from a workstation. I choose to NOT
anything from the original installation. The un-install is successful
the machine reboots.

When attempting to login after the reboot, the station is unable to
connect to the network and simply returns to the login screen.
Workstation Only is successful. I then deleted the remnants of the
Program FilesNovell directory.

Attempts to login from the "Red N" hang the station.

Only a reinstallation of the Novell client allows connectivity.