I am trying to mod springvale in the GECK and the first time I loaded up "Megaton World" and hit "Megaton Entrence" it loaded up everything and I could see all the buildings and objects etc etc etc. . .
Now I load it up and all I can see is Megaton and a very undetailed landscape. I've tried everything I can think of, even uninstalling the GECK and reinstalling it and it's still doing it.
Here is a screenshot:
http://i1167.photobucket.com/albums/q635/Nifty62/Untitled.gif