http://ift.tt/2cNIVb4

When I go over it my axe (or whatever is in my hand atm) becomes black as well. Not too long ago I made worldedit lag my pc by accidentally missclicking, causing me to change 100000 blocks of air to signs so they all went falling down. Not sure if that has anything to do with it. This made me give up on my world because everything was gone suddenly, there was even an octopus swimming in the air, basically everthing turned to air wherever I went, and now it's suddenly normal again (except for that blackhole).