(Fixed) Slide -> Scale modify curve

I was asked to post an example of "Slide-> Scale modify curve" of how I created the example here with the spiral/scale modify.
In the latest version that does not appear possible, with a result showing as:-



If I go back to build "Voidworld jul-10-12" (which I have to do quite often these days), I find that it works correctly:-



I have attached the vws example file.

Fixed.