I'm not sure if the following is a microsoft or kix error;
Having all the new updates from microsoft I saw my cmd-box changed from DarkBlue with White letters changed back to white on black. So I changed this back in the settings to darkblue with white. Now I have a kix script using a box on which I used black as being the shadow.
To my big surprise Color "N/N" gave no longer black but blue. So I changed the settings of the cmd-box back to white on black ran the script and to my surprise black was black again.