I have noticed that quite often a filled zone has moved from where I created it. I am sure it is something I have done while editing without noticing, but I haven’t quite figured it out yet! I have to move the zone back to where it was, and it frequently has moved off any of the grids that I have tried. So I go to a small grid (0.01mm) and do an M for move, and then switch back to my 1mm grid before dropping it there. So it will be within +/- 0.01mm of where I want it. But it is not long before it has wandered off again, and I have to do this all over again. I have searched but not found any way to lock a filled zone. It seems like in most (maybe all?) cases it moves up and to the left a few mm.
Any pointers would be much appreciated!
Using Win 7 Pro, Kicad BZR 6271 from 2015-10-16