can't change sky color

I don’t know if this is a bug or just me using the sky sphere wrong but I can’t get the Override Settings to do anything in the BP_Sky_Sphere:

http://dl.dropbox.com/u/7990437/sky_settings.jpg

Is there something I’m missing here

You’ll need to uncheck the “colors determined by sun” box in your sky before it will use the override colors.

I want to add to this post. It seems that you literally cannot remove the base blue color from the sky sphere blueprint. I’ve turned off the colors determined by sun box as well as found the original texture for the sky sphere T_Sky_Blue and replaced this with a green one. I’ve also edited the C_Sky_Zenith_Color and C_Sky_Horizon_Color color curves and finally I changed the Zenith color inside the M_Sky_Panning_Clouds2 material.
No matter what I change, the base color of the sky sphere is always blue. Its really strange. If you take the Overall color value of the sky sphere and drop it down to black, you’ll see what I mean. There’s an underlying blue color to the sphere that’s always there regardless of what you set the other color values to.

Oh ok. I just figured out its the Atmospheric Fog that’s adding the permanent blue tone to the sky. There doesn’t seem to be a way to adjust the color of the fog though. This would be really nice as its required for the God Rays and it makes the lighting in the world look much nicer.
Also I’ve noticed that playing with the values for turning the Sun Disc on/off or trying to change the Sun Disc scale doesn’t actually affect any changes. I started my level with the Default scene option FYI.

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Atmospheric Fog will distort your skybox colors