Johnfb,
The MaGui F or final version does not work with the widescreen mod and unfortunately there are no plans to create one. MaGui 3.4 does have a widescreen mod. I do not know the answer to why the map is not showing all of the features but you might be able to find the answer in the Magui thread.
http://www.subsim.com/radioroom/showthread.php?t=166320
Good Luck