Trouble with movable actors

GamesforGood

Hi there GS crew,
I am creating an infinite game where platforms move downwards and when they reach the bottom of the screen they pop back to the top shifting their x positions using change attribute. The player is a ball that can jump up the platforms. The problem I'm having is tat the ball moves the platforms up and down if it hits them with enough force, to the point where the platforms on the right and left side aren't aligned. I have to keep the platforms movable however so that its easy to control the speed, Interpolate won't work for my game. Any suggestions on making the platforms not movable by the ball , but still collidable?
Thanks

tatiang

Please don't start new threads for the same issue. Update your original thread with a new question or more information if needed.

http://forums.gamesalad.com/discussion/80381/help-with-immovable-actors/p1