Thanks WarriorTim! The cloudy sky in The Burnt Land II is one big painted panel, and on a wide screen its right edge showed, with the plain blue under it. The game decides which edges of a panel players could never see on the classic screen and carries those on for wider screens; this panel's right edge reaches only about one pixel into the classic view, so it was counted as visible and left bare. That pixel no longer counts. Refresh the game and the sky runs to the right edge at any window size.