Sun and smoke simulation

Support Particles and Physics Simulations
1

I’ve tried using a smoke simulator with a sun for lighting but all the objects in the domain appear black but when I use a point lamp it appears normally.

Is there a problem with sun and smoke simulation??

2

Render engine ?
Materials ?
Render settings
etc etc etc
All important info missing from post. Please supply ALL info

Please supply demo file which includes ALL relevant textures etc

3

Blender internal
here is the test file

You can note that once rendered the cube is black. Try using a point lamp and all is normal.