It's good to hear the "green flashes" issue is sorted for you. What game console do you have? and have you tried to playback a movie (with plex, netfilx, amazon prime) from the console and see if you get green flashes?
I'm on 1270.3 and the update did not change the colour space (set to Auto as well).
I don't have a firestick but I still get green flashes when playing back from my nvidia shieldtv connected via HDMI-ARC.
Perhaps the update only solves the green flashes issue when using a stick? It would be great if owners of sticks and xboxes or shiledtvs share their expereinces.
I have a Xbox One X connected to my Mu7000 it seems the green flashes are gone while gaming and flashes are gone while watching movies. There are critical flasges when using the Xbox to play HDR games. These look like critical HDR failures (screen flashes extremely bright white and image comes back together in milliseconds ie. Not an instant return to the images like the green flash issue.) I've experienced this issues while playing Assassin's Creed Odyssey. I have a feeling that if they acutually updated the TV with HDR 10+ it would remove most of these issues since it would use dynamic HDR information. Also when this update hit both of my Mu7000's it did screw with colors on the larger TV that plays SDR images 9/10ths of the time. HDR content still looks great though. Strange how this update was "pushed" to the Tv's were previous updates had a early realese on the website and this one did not. 🙄
I have found the green flashes occurre after the TV has been on for a long time. Like a component gets too hot and the green flashes are the result of that.
The issue that bugs me is coming from the xbox input to any other input (the other 2 hdmi ports) The darkness on the other ports are ridiculous and you can not see anything. The only way I have found to fix this is by choosing the terrestrial TV channel. Which then pops the dark bubble and returns the TV back to normal when choosing the other 2 inputs. This has been going on from day 1 and it so annoying. The people who make new firmware I am sure fix one thing and break another so they can justify what they do. Imagine if the solved all the bugs.... They would have done themselves out of a job!!!
I meant they changed the tv gamma correction not the setting value itself. On previous revisions I changed the gamma setting to "original" on the non hdr movie mode because it looked more faithful for some colorful movies and improved the skin tone for others. The rest i keep on "auto". Despite those differences it was just a small deviation between both. After the update, that deviation has clearly increased. That's what I noticed. However the "auto" color output remains pretty much the same.
Regarding the green flash issue, I can only especulate. I can tell you that in my case it was worse from the firestick input. Which is set to 1080p/60hz. The satbox on the other hand is set to 1080p/50hz. None of those have auto frame rate switching for content that I know of btw. The shield might. You might want to tinker with frame rate settings to see if that makes any difference. It could be helpful to report the issue. As I said it might be too early to call it solved anyway.