Still unsuccesfull, any type of atmosphere that is not standard, animated (lower quality ones). Crashes after 1st frame of animation. I have tried deleting 13 terrains and 3 bjects leaving me with one terrain and it still crashes. Really annoyed because took me hours to build this scene. I have tried saving the terrains as objects and opening them in another session and the same thing happens. I have done an animation before with 6 poser characters 30 terrains and  godrays (was a bit of a mess!, but managed to render 90 frames) . Maybe it is just this scene that has a bug?!  Is there a way to create a standard atmosphere but with the ability to look throught the clouds from above ? Really desperate to get any kind of atmosphere that is not the standard one.