The map editor from the latest installer do not start up.
the start scripts still include the old bin path.
to fix it edit the last line in in start_megaglest_mapeditor/start_megaglest_g3dviewer and:
change this:
./bin/megaglest_g3dviewer "$1"
to this:
./megaglest_g3dviewer "$1"
same for the map editor.