Hi Bill,
What do you mean when you say you can't change Shadow color?
Is the shadow always grey/black? Or are you unable to change the color swatch?
What is your starting point?
I just tried, and there is no issue on my end in 7.0.456. (There is an issue where Light Source Shadows are still unaffected by the Shadow color, but this will be fixed in a later update.)
Dries