Some people did have results with installing Windows completely new (not gonna do that) or buying another graphics card (not gonna do that either).
I hope a hotfix 4 will come for that problem; until then, I use online maps on a second monitor and try not to be spoiled too much. Even so, I almost missed a house in Act 2 and a boss in it because I thought I was in every house before ^^
yeah i would like to know if they at least have an idea what is happening or if they have to throw in the towel on that.