On 1.8.8:
When I run /fill ~5 ~5 ~5 ~-5 ~-5 ~-5 air It creates a big hole like it's supposed too.
On the snapshots:
When I run /fill ~5 ~5 ~5 ~-5 ~-5 ~-5 air or any other block it says:
The number you have entered (-1.0) is too small, it must be at least 0. And doesn't actually fill anything.
Invalid, you're trying to fill blocks in the void.