When you make maps, and people get bad tokens. It usually means that their PCs cannot handle all the loading of meshes at once.
It may be best to place "removable" meshes in their own files so if they do constantly get bad tokens, they can remove some of the .obj files and be able to get into the map.
I've had this issue before, and that USUALLY helps. Another thing is to be sure there aren't collisions on almost everything, like certain rocks, trees, plants. This can also help if some of the objects have collisions, while some do not.