Yeah, I have done it that way numerous times but the tutorial that I am following sets up the image planes as follows:

In the perspective view create a Polygon Plane and rotate it 90degrees up
Open the Hypershade and create a lambert
Attach an image to the lambert and assign it to the plane that I created
Go to the side image plane and press keypad "6" for it to show.

The problem is that the image is present in the perspective view on the plane that I created but in the side view it is just a white plane with no image.