I believe I am having the same flicker/banding/glow issue with my 30HFX85 unit as well, but wasn't evident until I started using a Comcast HD box w/ my tv. As stated previously in this thread it seems to be something wrong internally w/ the Television trying to auto color correct/brighten the picture. Something interesting is the problem only seems to occur when the source video is HD.
For example, watching LOST last night in HD, colors were going haywire, but during commercials that were sourced from standard def no problems occured. Obviously the commercial has been upconverted back at the Comcast office or through ABC somewhere along the line, so it's in 1080i. So the problem does seem to be with the TV. Which also may explain why my upconverting DVD player didn't cause the television to have errors (through both compontent and hdmi).
Another thing to mention is that I'm experiencing these problems over component, where as a lot of the problems here seem to be w/ HDMI.
My main question is, do the ISF settings that Fugiot posted correct these problems? Or were those just posted to correct more minor picture complaints?