Hello and a happy new year,nI have tried a few different meshes and setups now and it seems like the mixing plane or rather the interface between the two zones is the problem. When I change the interface to a normal interface and select no additional option under turbo create, I can generate particle tracks. I am getting my old error when I try with pitch-scale or no-pitch-scale interface instead of mixing plane. Does anyone have an idea why this might happen?.Thanks in advance.n