Problems controlling Sun & Artifical Light rendering function

[eballantine]

I'm trying to render an image using the Sun & Artificial lights option in the rendering palette and am having difficulty getting both exterior and interior lights to be visable at the same time. I have checked that all is active in the Visibility & Graphics 3D Overide options palette and also in the viewport options palette but still can't get both to work. I have just recently upgraded to Revit Architecture Suite 2009 and am trying to familiarise myself with the revised Mental Ray rendering engine. I have been using the studio light family as my only artificial light source. Does this have an effect?

[Gigmahabir]

The sun may be washing out the lights. Try to render with the Exterior: Artificial only box selected to ensure that your lights are functioning properly.