edit--500th post !! (100 per year average...)
I too am having the "red flashing" issue -- although I called it a 'shifting palette' issue !! Newest FW too btw. Here's a cut and paste as many people watching this thread probably didn't see it. It's also my belief that EVERY tv is suffering this issue but as it is only present in certain situations people aren't noticing it. I first noticed it as I kept seeing a dimming and brightening and then managed to link that to certain screen movements, began watching it closer, noticed that the palette would shift and then began linking the behavior. This post was BEFORE reading anything in this thread about this issue.
Hi, happy new owner of a Sony KDL-52V5100--first LCD TV, I did have an HDTV previously to this one which was a Toshiba 30" CRT. After watching the new Tonight Show (or whatever it's now called) with Jay Leno I noticed an issue where the palette seems to shift. This is most noticeable on people's faces but is also happening on other parts of the screen. I have all image + color enhancement set to off and am using only HDMI cables, my TV is not very calibrated but I am using settings suggested by another set owner on AVS. Additionally, my set does have the updated firmware which allows for auto contrast adjusting to be off and it is off. I have ruled cable out as the culprit as I have watched a 720p x264 version of The Jay Leno show on my PS3 on a different input with a different HDMI cable and notice the same effect.
Now this shifting palette is not happening all that often but seems to happen when there are other major things happening on the screen esp. with bright and fast color. It is MOST apparent on the new Jay Leno show because for the first 15 minutes he is standing in front of two pillars that are on his left and right that are constantly dulling/brightening--I notice the palette shifting when either the pillars rapidly change colors AND when Jay moves enough where parts of his body also move over the colors. I have also seen this on other news programs in HD when the background is fairly consistent and then a big bright banner ad on the bottom will swoop in or out that the rest of the scene is being effected! For movies and general TV watching it doesn't happen very often, but the most reproducible example is when I'm watching cable and then bring up the info banner (takes up a big chunk) I notice the palette on the entire screen brightens. Is this an inherent LCD issue that has to due with backlighting or something, OR does this sound like an issue with my TV? It seems like an LCD issue, but after some googling/researching am not seeing it mentioned. The palette shift isn't very huge, and will only happen when certain conditions are right, but it can be unbearable--sometimes on the new Leno show the palette can shift 4 times in under 10 seconds!!!