By accessing Operator Client from the machine connected to the video server, after an unspecified amount of time or when opening other Bosch cameras, the Live image of the ONVIF camera stays black.
This also happens when opening in full screen any camera and reopen the stream of the VSG camera → its image is black.
Regular Bosch network cameras don’t have this behavior on the system.
Activate the option of grabbing the stream from the VSG and not directly from the camera → under the Workstation Settings (in Configuration Client) > Save & Activate
If the recommendation above didn't solve the black image of the camera, please also consult the articles below: