Blender window type icon only changes header Simple question: When I change the window type using the window type icon at the upper left corner, the only thing that changes is the header. How do I actually change the window itself?

I am using Blender 2.75 on Windows 10.
You probably just using wrong thing:


If you use top-left button to change window type it will only change the header, so you should use the one at the bottom left (marked in green)