Game crash after backtracking from the northern most root to the destroyed radar site. the game started freezing up ( dropping from 40/50fps to 1/2) followed by the OS terminating the game.
The game started freezing at a point just south west of the destroyed/attacked radar station after backtracking there after having done the topmost root objectives. unknown if reproducable as it may be a pile up of steps which took about 6/10 hours to do.