Affects Version/s: Minecraft 1.7.2, Minecraft 13w47e, Minecraft 13w48a, Minecraft 13w48b, Minecraft 13w49a
Fix Version/s: Minecraft 1.8.3
Intel core i5
Intel 4000 HD graphics card
Java version 7 update 45
Windows 7 Home Premium
When using the AMPLIFED world generation setting, sometimes trees get generated with the top layer of leaves at y:256. At this height you are unable to place blocks except water and lava. This means that you can not replace the leaves once you've broken them.
How to reproduce:
Generate a new world in 1.7.2 using "AMPLIFIED" world settings and the seed: -7225359505972818499
Break one of the leaf blocks in the top layer of leaves.
Try and replace it.