Full screen mode

We have an drawing application which connects to Word to show the drawings. It used to work fine but now opens Word 2002 in full screen mode (no toolbars, menus etc). Using Alt+V and Alt+U doesn’t work. I can open my Word 2002 separately and its fine.

Now I know its the vendors issue but we did not have this problem in Word97. Does anyone know of an Word option that could be causing a conflict? I’m just trying to understand why this is happening and I don’t think the vendors know either.