It's been a long time since I've used SM, and I'm trying to build a new inverted coaster. I've ran into a problem though, and I don't recall ever having this problem before. I've just added a zero g roll that has 5 control points in order to better control the banking. After adjusting the banking, I can get it to where it is fairly smooth. Here is where the problem starts. I save the file and close SM, and then open it back up again, and the zero g roll is bumpy again. I adjust the banking on two of the control points, and then adjust them back to where I originally had them, and it is fairly smooth again. I save the file, close SM, and open it back up again, and the same thing happens. [?][:(!][?] Anybody else ever have this problem? Brian, you got any ideas why this would happen? I'm using version 1.46 if that helps.