Michael,

> Hi Dave, so it would probably help if you could make that line script example
> that leaves a ghost object, so I could run it over here and check it out.

Here's a short script that shows the problem:

var p1 = moi.vectorMath.createPoint(  0.0, 0.0, 0.0 );
var p2 = moi.vectorMath.createPoint( 10.0, 0.0, 0.0 );
var f  = moi.command.createFactory( 'line' );
f.setInput( 0, p1 );
f.setInput( 1, p2 );
var result = f.calculate();

- Run the script (the viewport should still be empty afterwards).
- Start a new line using the normal MoI UI interface. Click to set the first point somewhere.
- After the click, the line created by the script should appear in the viewport.
- Click to set the second line point.
- The script 'ghost' line should now disappear and never appear again (unless you re-run the script).

Hope that helps...