As you can see the other spheres have textures but mine does not.
I do have textures in the material editor and it does work in the world, but I want to be able to view and edit it without having to go out of the editor.
Hey Nirn -
Select your Layer Blend Nodes in the Material Editor and under each of the Preview Weight settings in each layer set the value to 0.333 (you have 3 Layers divided evenly into 100 is 33.33% or .333). As you do the preview sphere should start to have your material shown on it. You will need to repeat this process for both the Diffuse and Normal Layer Blends.