I've noticed that when watching a movie on DVD(very evident on those w/ 2.35:1) that the bottom bar is 'bent'. About 3/4 of the way to the right side of the screen. The top bar is not as bad, but it, too, has some evidence of this on the LEFT-hand side. What causes this and how is it corrected? I have a Toshiba 50" widescreen.