Discussion about the map editor for Heroes 5.

I have Heroes of Might & Magic V - Hammers of Fate 2.0 installed. I can't build maps. More precisely, I can't select objects and change the terrain (change the grass)! Everywhere it's empty; I've already tried using the object filter and installing the Russian language pack, but nothing helps. I also have Heroes 5: Throne of the King, and the editor there works fine. Please help! PLEASE! :(:(:(:s
You'll probably suggest mapping in that editor (Throne of the King) and then putting the maps into Hammers of Fate... BUT NO, I WANT DWARVES AND I WANT SNOW!