Okay, WOW!!! I just tested that out on a much more elaborate version to see if it would work with multiple colors and variables, and other than the initial error it works for EVERYTHING! Not only that, but it seems to be 100% animatable, and it saves and when reloads the expression doesn’t throw and error and functions 100% correctly. So while this is only an initial test if Natron can do something with SeExpr that is supposedly broken in the original package then I think Both You and Natron earned a Mega Major Brownie Point.