last week, my shade-c 0.90 water disappeared when I moved camera to its edge, depending on camera angle (tile<45), but only in my editor where I used only water related things (everything else removed), and only in case of one level, when normal-map was the 1st skin. when I put there a texture and used bmap_to_normals, and 2nd and 3rd skins were added also by script, it was fine. I don't really understand it, but I hope it might help a bit...