Here’s something else weird I just discovered.
If I go into 4 view mode I can upload separate images into separate views. I can then hover my cursor over a view and maximise it and it retains its bg image. I can then go back to 4 view mode and hover over a different view and maximise that and still see the correct image.
If I stay in maximised mode and change views, however, the bg image will not change to the correct image uploaded for the new viewport. Does that ring any bells?
It means I can continue for the time being but its not really a solution… and pretty bad for efficient workflow.