I think if you have made a wolrd in minecraft 1.6and then you update to 1.7 the potions won't work
Yes this is true in 1.7.4 too
Yes I still have that problem (1.7.4)
Confirmed
confirmed
Vagossssssssss
I think if you have made a wolrd in minecraft 1.6
and then you update to 1.7 the potions won't work