I have a huge nether wart farm, it is massive, and used to produce vast sums of warts. However ever since 1.2.4 no warts have grown, they just stay at stage one.
Yes the farm is in the nether, Yes it is set up such that it should grow. I am not doing something wrong. It worked before.
Now this farm was a big time investment, and now it seems to be useless. So what gives? Why don't warts grow? Is this issue ever going to be fixed?