Moves with a step size less than 0.5 result in no motion when the sprite is positioned at the top and left boundaries of the screen. Motion does result on the right and bottom edges The speed can be changed by adjusting the Speed * 10 slider and clicking on green flag. Note that if the speed is increased to something that rounds up to 1.0 or greater, motion works on all edges. The blue sprite is draggable so you can change the start point if you want (move it while it is saying that it is moving towards the center). Doing this shows that it's not an "On Edge" condition - it can take fractional steps if you move it away from the maximum screen dimensions a bit.
