Applicable for Works 1.0.0 to 1.2.0
The GWorksSlave is visible in the GWorksMaster. This may happen when the GWorksMaster is inserted on the first track of the session.
Insert the GWorksMaster in the last track of the session. If you already saved a session where the first track has the GWorksMaster inserted, move this track to the bottom and then save the session again. Once you reload the session, all the metadata will be restored.