IceX2.0 is a Good Progamm for Terrain making...
I Have no Probelms with exporting the Terrains to Version 6.50.4/6.50.6

cYa Sebastian

Tutorials:
[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains
CLICK HERE