Im playing minecraft normaly and when im make the Bat-pack 
it works fine, but when Im put the Bat-pack in the armor slot it said Saving chunks and quit the game. Unfurtenely I cant put the error log because it is too fast. Im not sure if this is a bug but if anyone can help me Im will thanks a lot.
Sorry for my bad english but Im portuguese.
Update Forge to 1.3.3
I have the same problem, but iy occurs when fighting with cows or pigs etc...
Forge problem ?
@1: You sure you arent using v1.64?
@2: Millenaire and NEI conflict caused by a NEI bug
Problem solved !
After a few tries , i had identified the buggier: it was the vertical redstone mod.
So all is working fine , and Millenaire works fine too , no bugs with IC2 for now !
