Board Thread:Bug Reports/@comment-25012056-20141221174751/@comment-27723099-20141222134352

So you opened a world generated in a previous version or is it all in Beta 19? That might have caused it. But it's not the only possible cause, since the generation bug that I posted was in world tht has seen only the last version. It could be that it is caused by other mods that add blocks. Do you use any other mods?