Vectrosity line smoothing issue.

Hi, I am using Vectrosity for drawing and I have some unexpected behaviour when try to draw symmetric smooth line.
I have 5 points - two exteme points (center of 2 spheres), two “neighbors” of extreme points and middle point. I want to draw something like this:


I created 5 points, and array with 4 width values.

When I draw line without smoothing, all is ok:
But when I enabled smoothing (line.smoothWidth), line began to draw wrong:
(2 - middle point is ok, 1 point is ok, 3 point - wrong). Please see the picture:


I am sure that all point positions are correctly (I created sphere object in this points and all looks like on picture without smoothing - I mean that all poins on their place).

Here is my code:

//create line
VectorLine line = new VectorLine("Line", new Vector3[]
                new Vector3(0, 0, 0), //first exteme point
                new Vector3(0, 0, 0), //segment near first exteme point
                new Vector3(0, 0, 0), //middle point
                new Vector3(0, 0, 0), //segment near second exteme point
                new Vector3(0, 0, 0)  //second exteme point

...Update point positions...
//update width
float width = 40;
var widths = new float[] { width , width/2f, width/2f, width};
Vector.SetWidths(line, widths);
line.smoothWidth = true;
Vector.Active(line, true);

I am using Vectrosity 1.4.2.

Can you please help me with this issue?

Lines are smoothed from one point to the next, so it should do what you want if you add another point.