Well last version of udk when I select FlatTessallation the preview goes crazy and in game too. But when I go to the game and switch to the editor works fine, I close the game and other time crazy. Here you have some screen shots: https://www.dropbox.com/s/12m6w1d6powg9io/Dwm%202013-08-09%2016-08-35-14.jpg…