Hmm I had an error with example1.bmx for me it was that the LookAt and PointAt function both did the same thing, and Chris had removed the LookAt without updating Example1 to compensate.
You might just have to change line 27 to:
cam.PointAt(0,50,0)
You might just have to change line 27 to:
cam.PointAt(0,50,0)