Hi Bruno,
Regarding copying the graph, I have been using ver 9.1.6 and i see there's an option for the graph. (not sure about error message )
When you scroll over your mouse to the graph, you will find an icon on the top right corner. Clicking on it will expand the graph to somewhat semi-full screen. You will get an option for copying the graph by right clicking on it.
Please check and confirm.
Regards,
Vaibhav