Differed rendering multiple lights

I'm using differed rendering for shadows on point and spot lights. Which shows fine in the scene view, however more than one light does not show in the player when set to differed lighting.

The materials are 'default simple'. (I suspect the problem is here)

So I have two questions.
1. What diffuse shader works with differed and multiple lights?

2. Where are the shaders that the scene view uses?

Thanks,
Doc