I have a problem with this set and cant seem to rectify it. The set has 4 modes , natural,active,100htz,progresive. in natural and active mode overlay menus, i.e. like the one from a decoder box shimmer/flicker randomly.In 100htz, does it all the time.this is through scart 1 with RGB enabled on the decoder box and dvd.On terrestrial tv, its possible to see the top of the screen do it to wherre the blackness /picture meet.Im no tv engineer,but to me looks like its refresh rate is changing. it does it in the picure too.I have tried tv,dvd,decoder,etc and on all it seems to do it,Its much easier to see it when menus are on the screen. Auto format is turned to off.