The biomebrush is broken in the newest voxelsniper build (#197)
You can't change the selected biome this problem occured after the recent change to accept biome names containing spaces.

Weird, I'm pretty sure it worked, when I tested it last time. I'll check it later today.

Ok, when i select the biome brush (/b biome) it displays "Biome brush (currently not working)"

It works now, thanks man