heyas; first, make sure your ik is turned off. second, if you have other figures in the scene, you'd best lock them (figure: lock figure) before performing the operation, it seems every time i do one of these, ALL my figures swap. now the problem with the symmetry, any kind of symmetry, is it only does the limbs. you'll have to 'reverse' the torso, neck and head yourself. just reverse polarity on the twist and side-side settings.