Well i download a .capx file provided by a kind soul. That file is a simple slingshot type of stuff and it worked so well. When i port it on my game, It was OK until i change the resoulution of the game to " 800x1280 " and then, The slingshot(Two sprites) was parallel to each other, If you cant understand, I'll try to provide a screenshot. The thing is, it worked so well on 640,480 but why it becomes buggy on 800,1280? Thank you