the hit boxs for blocks in 1.7.1 are darker

Gamemode is not relivent

What happened was...
I started up Minecraft with a new world and i saw dark hitboxs on the blocks

Steps to Reproduce:
1. start the Ninecraft launcher
2. turn snapshots on
3. play in 1.7.1
4. create new world
5. look at a block
you will see darker hitboxs