When I start my game, opening and closing the window is okay if I do it once, but it goes wrong if I do it again. 1. The game starts: window 1, "Title Screen",(0,0)-(672,416),1 maxwindow 672,416 minwindow 672,416 -> thatīs ok 2. I choose the editor: Window Close 1 window 1, "Level Editor",(0,0)-(1280,704),1 maxwindow 1280,704 minwindow 1280,704 -> thatīs ok 3. In the editor I jump back to 1. window 1, "Title Screen",(0,0)-(672,416),1 maxwindow 672,416 minwindow 672,416 -> now it is wrong When 3. is done, the big window closes, small window opens as expected, but it is white. The program itself seems to be working, I can quit by pressing Apple+Q. I can also switch back to the editor. Then the small window closes, the big win opens again but some parts get visible, others are invisible, and the more often I play around with it, the more problems in window output come up. What am I doin wrong?