What are your render settings? It appears that IDL is off if deleting the sphere didn't change anything.

This is a quick setup I did with the PP2012 Raleigh Tavern with one infinite light at 35% and a point light in the foyer at 5%

To set up Renders in PP2012, I use the included D3D script, found under scripts>Partners>Dimension 3D>Render Firefly, which shows everthing and allows you to save various settings.  Make sure Enable Indirect Light and Enable Raytracing and Use Irradiance Cache are checked, and that raytracing and shadows are enabled on all of your lights. 

Load the dome, apply the gradient material in its folder in tha material folder, make sure that cast shadows is checked in the properties of your Ground plane, delete (or set intensity to zero)all of your lights except one infinite at 35%, which will be the Sun, so it should be coming down from the right (based on the shadows of your first render)...

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