To follow up on this thread I have another major issue, not sure whether I should have started a new thread.
I set a frame as the ObjectReact and this is fine while using it in the active session. As soon as I save/close and reopen, the GFX object doesn't connect to any ObjectReact any more. It also won't connect to any object at all. If I delete the ObjectReact modifier and set up a new one it still won't connect to an object.