What do u mean you cant import it? If it shows you a Green Cube when u first import (with the Right Paths) then you shoudl restart World Editor and it will be there
Yeahp. It actually says so in all of the import guides
But really. When youre saying "cant import this model", im sure you imported models enough to know the drill, so, whats the problem?
Oh and... some models are made to be specefic things, and does not work well with other things. For example: A model made and specialized to be a doodad, will some times have problems being other things than a doodad. This is extremely rare though...