It's not adventure racing Shane, either the control is in the right spot or not.
Cancelling the results because one control was on the wrong rock surface seems a bit soft to me and a bit harsh on the setters and some of the early starters who seemed to find it without too much delay.
In this day's case ShotRat lost 15mins or so before stumbling over it, Bruce found it because ShotRat was there at the time and Craig found it because it was by chance located on his attack point. They were the first 3 starters. Next, Grant Bluett, one of Australia's best ever orienteers couldn't find it, I arrived on the scene as he searched. We then went hunting for where it 'could' be and found 3 of the 4 controls in the area. Jim arrived and then Simon, none of whom were in any doubt it was misplaced. After that it was fine as I stayed there while Jim went to inform the organisers.
Strange as it may seem, half a minute of dicking around can cost someone the race, let alone more than a minute or two - have a look at Craig's splits, or Grant's on another day - - they don't make mistakes very often, if at all! You can't fairly let the results stand when people have lost 6-30mins because of a control in significantly the wrong place. At least everyone else was happy enough to complete their runs and still get the usefulness of comparing splits.