The other thing I've noticed is now when I click on any vertice in the editor, it blanks out all the grid dots for about 10 meters above & below the point, and all the way across the screen from side to side. This goes away when I click somewhere on the grid besides the vertex or try to move the slider bar. Also...on coasters where this happens, the track in the simulator appears extremely jagged... I don't know why...and it bugs me.