I am having a problem with ProjecttoCplane. I model boats and often need to project to the c-plane. When I do the command, it puts the new curve not on the actual c-plan but offset from it slightly, by about 5/32". It does not project ALL THE WAY to the plane. I have to make a centerline on 0,0,0 (cut plane) and use it to pull the chosen 3D curve to get it to lay down on the c-plane.