i know this sounds crazy and impossible, but after just updating from ML, i now have image retention on my rmbp. before i updated, and had just got the laptop a month ago, it had absolutely no retention. i would have this safari window open to macrumors, read for a while, then log out into the login screen with the dark grey. Nothing was there. now, after updating and being on a white page for maybe 5 min, i log out to go eat, and as its doing its turning animation to log out, i now see distinctly where the safari page was open. idk know how that is possible. i did something something software related that affected something thats basically physical. i know for a fact it wasnt there before and now it is. I know everyone is going to say i just never noticed it before, but i checked and rechecked for that when i first got the RMBP and in the weeks following. Did anyone else notice this?