Version: 1.0.0 What is the bug: Generate any BiomesOPlenty world, find Grasslands biome. Without fail, except for an occasional Thaumcraft Greatwood tree or Natura Sakura tree, EVERY TREE in the biome is an IC2 Rubber Tree. If you disable Natura/Thaumcraft, it's every tree, no exception. Mod & Version: BiomesOPlenty 2.1.0 Paste.feed-the-beast.com log: Can it be repeated: Yes, as described above. Create new world, BiomesOPlenty world type. Use seed of 1. No quotes, just 1. /tp to x:1060, y:70, z:-1060 You will be in Grasslands biome, one greatwood nearby. two pink sakura trees, the rest all IC2 Rubber Trees. Happens in any world you find a grasslands biome in. Known Fix: No idea whether it's a mod bug or config issue.