I tried as well, but I cant make it work..
Btw I have tried BOTH paths:
1. TerrainArt\x\x.blp
2. TerrainArt\Ashenvale\Ashen_Rock.blp
3. TerrainArt\Ashenstars\Ashenstars.blp
4. TerrainArt\Ashenstars\Ashen_Rock.blp
5. TerrainArt\Ashenvale\Ashenstars.blp
I have last version of wc3 editor & tried both paths + more, none work..
Fix this problem..
EDIT: A friend of mine tried it aswell (every path I wrote), didn't work for him either, you messed up..