To avoid problems with spline rotation do the following
Create -- spline then zoom in and delete the 'S' cv this will move the rotation point ans the 'S' cv to the spline transform settings then create your spline layout by just using the 'E' cv
Again from the Tutorial
Did you rotate the spline from EW to NS ?
If so you MUST freeze rotate transformtions ( Edit --Freeze Transformations--- and just select Rotate then Apply ) before running script otherwise you will get some strange results.