I see some one else has had the same issue. Here's the link to my capx. http://www.neoprofessor.com/corrupt.rar. Had to zip it with winrar. I stripped my game down, so heres how it goes... As soo as gane starts my Ninja faces an enemy, press spacer bar to strike enemy with sword. Enemy dies but within a few seconds my inja sprite vanishes. Ive made the Invisible box that the sprite is attached to opaque so you can see that its only the sprite that vanishes. The box (Ninjabox) has all all of the behaviors coded into it. However, if you dont kill the enemy, he doesn't dissapear. Furthurmore, if you kill him and run to the right fast, jumping over the pond quickly enough, he doesn't vanish but he drops through the "walkright" floor which is the actual solid surface following the jump that the spites actually walk on.