I purchased a 61Z786 last October and was perfectly happy with it until about a month or so ago. I noticed that when there are dark areas on the screen they get a green cast to them, sometimes very green. Doesnt matter if it is DVD, off air, etc. If it gets dark, instead of getting gray it gets green. Also, I have noticed that things that are supposed to be green are REALLY green, almost vivid. Yellow seems to be a greenish yellow. All other colors look normal, bright scenes are normal colors.I have seen many posts here in the archives about green areas on the screen (apparently with earlier manufacture dates). Has anyone seen the problem I am describing? Is this a color engine problem? Any help appreciated.