Anyone know how to stop sprites from rotating?

I have the grid set up, its generating a path and chasing after my character, but it keeps rotating. If i set the rotationspeed to 0 it does not move at all. I have tried this with both the AIFollow and AIpath. does anyone know how to fix this?

Screenshot? Video? something?

I ended up figuring it out, you have to replace line 232 with
tr.position = Vector3.Slerp (transform.position, target.position, speed);