I imagine this is a pretty low priority, but when you try to change a character's skin color in the character creator, it just makes them pasty white. Neither arrow changes them off of that option afterwards.
EDIT: So it definitely *is* changing the skin color in the variables, because if you save and re-load the custom character the skin color changes. It seems to just always display the preview as white if you click the button to change skin color regardless of which option it's on.