I found part of the problem, I was recalling the dynamic material in the construction script in a material variable which did not accept it because what I actually needed was a material ->interface<- variable (as I had thought the widget is making things hard as I can only apply a material interface to it instead of a regular material). The problem now is that a material interface variable cannot be used as target for a “set scalar parameter value”. Now to try and figure out how to do that.