Reality Factory

I made this wondrous level with terrain I made in NMTGT:

http://www.mediafire.com/?zvciipmng5h

Here is what the map was supposed to look like, as shown by RFeditPRO:

http://www.mediafire.com/imageview.php? ... 1w&thumb=4

Here is what the map looked like when I ran it in the engine:

http://www.mediafire.com/imageview.php? ... zx&thumb=4

Any ideas why the terrain disappeared, leaving me to walk on the bottom of my sky box?

Level is way too big. 10240x10240x976 texels is far too much for RF to handle.