When I fired up the Extended Map Editor (either with the direct .exe or through gameoptions.exe) I got this horribly skewed screen:
It only happens when, through the gameoptions.exe, I set the game resolution to either Desktop (mine is 1366 x 768) or 1600 x 1280,
AND Windowed. Other resolutions are fine, including full screen mode.
And why does it feel so sluggish when scrolling the map area in the extended map editor compared to the in-game editor? I love the features, but this "bug" and sluggishness keep me for months from doing any map in there.