They taped out a new line for the top section of the track, which was just loamy and as more riders went through, ruts formed and more roots became exposed. The top is pretty flat, even on the original opening section of that track, which is the left hand line from the top. It gets faster and steeper the further you go down the hill and is actually great fun to ride.
The problem they had was that a lot of loose material got carried down the track onto the hard pack sections and it got very sketchy, especially in for those in the third or fourth categories down the hill in race runs.
It was my first National Round as a competitor and it was a blast.