Using Bsurfaces addon to draw

I’m using Blender 2.77 to draw new Bsurfaces but when holding down the “d” key and dragging the mouse, no line forms unless I ignore the “d” key and use the GreasePencil draw function instead. Any idea as to why?
Used the “d” key to draw with the Mac version of blender but on PC it doesn’t work. My PC has a bigger and better screen. Please help.

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