Hi everyone, I have fixed the problem and can replicate it by reversing the fix. You had me looking in the right area, but it the clipboard zoom had no effect. What fixed it was ticking the following box:
In settings > user preferences > export > Under “Copying to clipboard” and “Include caption and border” you need to tick the box for chart.
The strange thing is that the designer is using the same QlikView desktop but can work fine without this ticked. The designer must effectively tick this box when it runs but the server does not. That is what was most confusing.