GameObjects Do Not Appear In Direction Light While Hard/Soft Shadows Are On

Alrighty. So I've been nailing at this for a few hours now but I can't get it to work. I'm making a block placing program and I put in a Directional Light and turned on Hard/Soft Shadows to make everything look cool. The Game View runs perfectly, as you can see in the image below. However, when I Build and Run it in Simple quality, nothing appears. I've determined that this is caused by the Hard/Soft shadows in the Directional Light. Because if I turn off the shadows in the Quality settings or run it on Fastest/Simple, I get this. http://imgur.com/nhwOjNt So now the blocks appear but there are no shadows and that's just ugly.

Does anyone know what's going on here?