I have been working with a blender file for a few hours with no issues. Then all of a sudden, I noticed the the lighting had changed in the Modelling view. I went to check how it came out in a Render and the render is completely black, with some tiny white dots which seeem randomly placed like stars.
The scene looks like there is a load of ambient lighting still there when I disable the sun effect in the World tab. Yet despite the extra ambient light (which I don't want) AND the sun clearly shining away in all of the edit views, the render is black and I can't work out why.
I will post a screenshot and my Blend file below:
Here is my .blend file: http://files.staging.x-rm.com/nick/house6.zip