The area I was referring to in that statement, BlueZero4, is the large central area, which initially had problems with the draw distance resulting in HOM effects. It has nothing to do with the supposed problem in the waterfall pit, and was in fact fixed over two years ago.
I honestly can't find anything wrong with the pit at the end. I've run around there and looked at it from all angles in both software and opengl renderers and can find absolutely nothing out of the ordinary. I have no idea how to fix it, as I don't see a problem there at all, and it doesn't seem like anyone else does either.