Screen aspect ratio problem

We have recently purchased a new laptop with a ‘widescreen’ 16:9 aspect ratio display.
Our Go Diagram application (Windows Forms v2.1.1) doesn’t draw correctly on this display if it is in widescreen mode. Only part of the area that should be accupied by the GoView is actually drawn and updated. It looks as though this is the area that would be occupied at the normal aspect ratio. We have some other applications that do not use Go Diagram, and these don’t seem to have a problem.
Does anyone know of a way (overriding some functions?) to force the GoView to use the whole of the area?

Are you saying that the pixels on your screen don’t have equal width and height?
How does text look, both in a GoView as well as elsewhere?