Hello Rob I think the DPM set to 'interact' in the DPM panel. I have attached an image. I am using two surface injections ,one from internal surface and another from wall surface. Is it possible to change ' DPM under-relaxed factor' and' Film step per DPM step' in DPM control under 'Solution method and Control' in EWF without turning on one or more of stripping , splashing and edge separation?