Which version of Lightwave are you using?
If memory serves correctly, it may be that you've hit the button, extender plus has done its thing, but you may not have moved the points away from the initial points - the end result being that it appears that nothing has happened.
I don't have Lightwave on this PC to try it right now, but it may well be that you need to move the points as well rather than just hitting the extender button.
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