This is fixed! which is great news, however Dome Land is still a very strange place...

What i have discovered is that transparent textures (png) do still behave a bit strangely, probably got something to do with what gets rendered first.
So if you wanted to make a double dome, for example, one with a transparent cloud layer and stars behind it, you might get somewhat frustrated to find that it is not as simple as putting one dome over another... What you need to do to make this work, I think, is make sure the object with the transparent texture is the first one in the xsi (from the top of the file viewed in notepad) otherwise it seems that it will be drawn behind the first object irrespective of its actual position in the dome model.
Another thing, is to make sure all the objects have there pivot in the same place, this is where the dome is viewed is from, you will view any object from its pivot point, if its still in the middle of a planet you won't see that planet.
Domes also need to be quite small, bits extending out of the visibility range will disappear.
Pictures will follow when I've made something worth looking at.

