Proposed fix by apenner tested succesfully on voronoi_problem.svg (attached above) with Inkscape 0.91 r13725 on Ubuntu 15.04. (the Inkscape extensions directory for me was /usr/share/inkscape/extensions).
Proposed fix by apenner tested succesfully on voronoi_problem.svg (attached above) with Inkscape 0.91 r13725 on Ubuntu 15.04. inkscape/ extensions) .
(the Inkscape extensions directory for me was /usr/share/