[etc]

А что у нас за ерроры?

TypeError: Error #1010: A term is undefined and has no properties.
	at BitmapPolygon/BitmapPolygon::lineComplete()
	at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()
	at flash.events::EventDispatcher/dispatchEvent()
	at Liner/Liner::mouseUpHandler()

А ещё, что у нас с русским языком?

http://lab.andre-michelle.com/physics-engine