I upgraded to FF18 Friday. This morning I'm having problems with the browser window, and the menu bars and bookmark side bar. The browser window goes completely white when scrolling up or down, with mouse scroll wheel, or the side slider. The areas where the file menu and address bar where the navigation buttons along with the bookmarks side bar will go completely black. I can put the mouse over the areas, and they are functional, though I cannot see what I'll be clicking. My system is running XP