I can say for certain that it was a Reality Data issue. Here is a quick test render with the same ground & character after I deleted the original scene due to being done wit the chapter. I get this all the time when I delete characters from the same scene since lets say I use a main scene with 6 or 7 character but I only need a close up with 2. As recommended I will delete all the other characters and unseen items. The finger nail color will jump from a deleted character onto the remaining one, if they have the same outfit with different textures the texture of the deleted one will jump on the remaining character the eye set ups get all buggered up. This happens on my notebook & tower...

 

Edit reply to STB I agree this was in moments of frutration with all the merging issues. I dont think one should need to rebuild the scene from scratch everytime but it seems in this case for example its the only thing that would of fixed the issue, which is why I just put another pair of hose on the character..