PBL Use a Blend Node into Spec Makes Diffuse go black

So 3 screenshots here same node network.

I am trying to do a poor mans metallness :)

So the idea of the Blend node is for me to make the Spec white on this brown area and leave it coloured in the other areas (white part of the mask)



In Phong lighting I get the correct diffuse colour with white Specular as previewed in the blend node



This is in PBL, for some reason the white pixels in Specular turn black in the Diffuse?



Bypass the blend node and I get colour in the spec - it seems to only happen through the Blend Node :(

Code

http://pastebin.com/hg2Adb9K