i dont know what the answer to this question is but how do you use the blender player because when ever open it, it comes up with the command promp for less than a second and then it closes.
I have tried your file with Blender 2.55 and with Blenderplayer 2.55 and both working on my pc (Windows XP 32bit). Only when I open your file with enabled autostart in Blender it did not work.
I’ve had this exact problem. I believe the answer lies in differences between setting the mouse position and getting the mouse position and something to do with screen resolution. I’d really like a solution! : (