Quote - Sounds like a Parmatic node issue.

Yes, it's the Matmatic function used to create a shader node with a name that is recognisable to Parmatic - in this case "PM:Gamma".
I have some Matmatic scripts somewhere that I know work fine in this respect, I'm just trying to find one of them, but I went off on a tangent, as I so often do. (To tell the truth, it was closer to a radial).

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)