Ive been using the V20 since 31 Mar and I personally have not noticed that floating black thingy. Im a big fan of black bars and never fills up the screen even during the first 100 hours or so. The black bars remain uniform as far as I could tell. Either my eyes are defective, or my living room is too bright, or my TV is "abnormally functioning well". Hehehe
Anyways, regarding those posts about the mid line of the World Cup what I notice is, if the camera pans fast, such as when the goalie kicks the ball long, there are some ms (milliseconds) when the straight mid line would blur. Whether such blurrying is caused by the V20 lagging on the fast panning, or, the HD broadcast cam hunting on its focus (because the green field on the background is practically monotonous) - Im not sure. I dont see double lines or triple lines or shadowing - I see a very very short period of blurrying if I stare at the line. Doesnt bother me at all because my attention is on the ball and the players running across the field, which never gets out of focus (well they are too small compared to the center line of course). Makes me wonder how the image would look if the playing field is full of huge parallel lines such as that of American Football.
Hopefully, Id get the chance to see how that WC center line looks on a fast response high end LED LCD.