map editor problem

i have a small problem with the map editor.
when i press cntrl shift and e  when it comes up with the map editor, the area where you edit your map is offset to the bottom right, only showing about 20% of the area. go here   http://i286.photobucket.com/albums/ll94 … 1/map1.jpg
for a screenshot.

i just would like the map centered when using the editor.