I call the initBiomes and registerBiomes methods in the preInit state.
The biomes just doesn't generate at all. If I raise the weight more than 1000, only ocean generates.
The console doesn't show any error.
Version: 1.9.4-1936
To note: I've been using this code since 1.8, and it stopped working in 1.9.4
Biome Init & Registers: http://pastebin.com/8iV7d035
Registry: http://pastebin.com/M7FUz65N