Does anyone else encounter a problem with "ghost" edges if you pause the game and open another application, then return to the game? If I pause to check my mail, for example, when I come back to FW there is always a thin, colored "strip" running along the left edge, and sometimes a thicker strip across the top. It doesn't go away even if you abort the level and return to the main menu. The only thing that makes it disappear is exiting the game completely, then relaunching.