It's not in that area specifically, but happens when there's a square box of bright content and is always aligned with that box, if that makes sense. So if that "box" moves, the shadow is always aligned horizontally with the box. I haven't noticed it in any Blu-ray movies, but I have noticed it if there's say a ticker say when I'm playing a PS3 game or something.
It also is visible if I change the display to 4:3 with the gray borders:
I also just checked using different image settings and seems to happen across the board. It also is visible with the OSD if I'm changing settings such as contrast or volume.
thanks that picture is better, rather it doesn't look as bad as what I thought I was seeing. Is it like a dim strip that sits above the black bar and ends where the white ends?