I am following a blender guru flame thrower tutorial. I am using a old version of blender (2.65) but I haven’t had this problem before using it. Anyway I render it and I get a solid cube, I know how to fix this by turning down the material volume density. When I do this it removes the cube and all of the smoke, rendering nothing on the scene. This is what I see in the viewport.
This is what I see in render.
This is what I get if I turn the material volume density down on the domain.
Here is the .blend file