Still experiencing the same problem with beta 10
I know, but I have no idea where the problem might come from at this moment...plus the ambient lighting is; lets say, a little too bright! 
I was afraid some users find it too dark... Note that if you don't like, you can choose a night hour to turn it off. By the way did you see that the ambient color is a complementary color to sun color? I hope my way of computing is ok (I computed the average of the other RGB components for each component, see here).
Thank you for your feedback.
----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
