6.40.5
Sun color and ambient color in map properties doesn't change. The angles work though.
I'm able to use camera.ambient and sun_light, to change the intensity but I can't change the color.

Sun and ambient colors only affect the static lights in the level. They have no influence on dynamic lighting.

Nope, I'm not using any lights in my level except the sun. Have you tried making a night scene by adjusting the map properties? If you can, then the problem must be with my installation.

If oyu have no lights placed at all, the level will be lit by default (makes sense for development reasons).

Place a light somewhere in the nowhere and it should work.

Firoball:
I think its range also needs to intersect some geometry to work.
cheers,
tindust

Thanks for the suggestions guys, but it still doesn't work. If no one else is having problems, then I probably need to reinstall GS...or just give up on the sun color