can't it be used on su5? it formed a group containing just one construction point at 0,0,0 instead of the 2x2 or 3x3 or nxn points 
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RE: [Plugin] SketchyFFD (Classic)
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RE: [Plugin] Blend ver 1.12.
even v1.7 and the lower works well, 1.8, 1.9 gives a notice like this "Error Loading File sublend.rb
undefined superclass `EntityObserver'" HELP