Get rid of HorizontalLayout in MapOutputTab and use manual resizing. The OpenLayers Map widget is now resized and positioned manually by a ResizeHandler method. The automatic HorizontalLayout was obviously broken in combination with the OpenLayers widget. This should fix various layout issues with the OpenLayers Map.

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END