The biomes are dimension 10 specific. You probably have a biome id conflict.
Have you tried to check the controls menu?
@People who've posted on previous pages
If you have an error with mob ids, there is a section on the first post in Q/A about it. It has been asked so many times that I think half of this thread might be that question.
If you have the error with id 133, turn flexible ids on in the config.
if you have the error with id 375, you're using the pun mod, and you need to set "Entity ID Offset" in the config to a higher value.
On another note, right now I am taking requests for the next update, as long as the suggestions aren't too large.
Hmm, that error is for 1.6.4, can't really help that.
That's an error that was posted previously. It would probably be much easier if it was solved on their side, since all they have to do is check for a casting error. It's also an error that shouldn't be happening if that mod only changes world gen in the overworld.