Beats me. I tried fiddling with that but the game was on for more than 6 hours. That's usually when the settings go real crazy. But what I don't understand is, why do the lots stay that way (white) for days even though I save them when my graphics are normal, when every detail is perfect. Maybe they weren't I'll understand that if it happens again. I'll check my grass detail to be sure and fiddle around with the settings.
And Mutantbunny, good luck