I was modelling the torso of a female body using the box model technique. Applied a mirror modifier and started to scale the mid section of it when a gap appeared. How do I fix or avoid this? Mirror Modifier Settings are as follows:: Axis: X - selected; Options: Merge, Clipping, Vertex G - all selected; Textures: nothing selected.
Select all the vertices (Alt+RMB) that should be at the mid point, then press scale along the x axis(whichever is the horizontal one) and press zero (SX0) this will align them all in a straight line.