http://img15.imageshack.us/img15/3081/screenshot2ts.jpg
So they are all there. This should be no big problem for someone who has deeper understanding of all this. We'll have to wait, I guess...
So it's definitely the BTT files causing this then. Have you tried changing the offset of your worldspace BTT files, to see if the wall of trees is created inside the BTT files or if it happens on runtime when the BTT files are "applied"? If it's the latter it might be as simple as changing a flag or variable somewhere in our custom BTT files. I hope one day we'll be able to open them in NifSkope without the errors.