Can any one tell me what I am doing wrong please.

The P6 render on the left of enclosed image was rendred in P6, (using p4 renderer) while the other was rendered in pure P4.

Why am I getting the inside of the dress showing up as black rahter than the fabric colour?

I have used exactly the same settings and lights, in fact I just opened the P4 file in P6.......but I get this problem all the time.

The greatest part of wisdom is learning to develop  the ineffable genius of extracting the "neither here nor there" out of any situation...."