Sprite blacked out using Standard Shader

Hi,

I am having trouble with using sprites and the standard shader, I have a spritesheet with a normal map and height map that I wish to use with Unity 5 and the standard shader. The sprite shows fine if I use the default sprite shader but when I try to use the standard shader with the sprite I just get a black square texture where the sprite would be. (see picture attached). Does anyone have any advice as to what the issue may be?


Thanks,

The Oz