I tried in a new map, same problem :/
The problem here, I'm certain, is probably what SoJ didn't explain thoroughly enough:
Whenever you import a model to your map, you will have to get all textures (in the case
of a model that uses ingame textures that's not necessary) and you'll need to give them
all the proper paths. What's more, is that you'll have to save, close and reopen the map
for every new set of doodads you import.