[Chimera-users] displaying two surfaces

I am trying to create a figure that encloses three residues in a protein in one surface and the rest of the protein in another. I put the three residues into one group using surfcat and the rest of the protein in another. When I try adjust the surface transparency, the three-residue surface all but disappears. If I set transparency to 0%, I appears normal. If I increase it even to just 1%, it almost completely disappears. It looks like wherever this three-residue surface is inside the protein surface, it only shows if the transparency of three-residue is set to 0%. All this is with the protein surface set to 50%. I'm not sure whether this list accepts attachments, but I put in screen shots of what it looks like. marcus