Apologies if already raised as a bug.

I have created a character and then used modify (material list) highlighted skin head, body, arm, leg & nails.
Right click Base Color for Adjust Color and made my character green.

However if you then apply a Full Skin, Realistic Human Skin you can no longer change the base color ?
Even if you ctrl z to undo the Realistic Human Skin the Base Color cannot be changed ?