Updating block metadata

[nixi]

Add this check in front of the hook:

if (BlockFace == BLOCK_FACE_NONE) then
   return false
end

Where exactly?

The right-click is called twice because Minecraft sends two packets.

If the right-click function was called twice, it would increase the number by 2 on one click. Instead it returns an entirely new number.
Here is a screenshot with all the scenarios:
http://i.imgur.com/9kVqPYU.png
The numbers returned in chat are simply the meta variable...