Hi I have a bit of the problem, We are a group of about 8 people, and we are having some problems using a map/world that one person made, on another pc, in other words, artist #1 makes a map in world editor, and programer #1 wants to use it, problem we keep getting is that either

#1, a object cannot be found
#2, map doesn't appear when loading it, even in the world editor

you should all use the same version of World Editor (latest version)
setup Game Data path on your folder,
set "path.txt" in tools to point to your game data folder
keep all data files relative to selected folder