Try
sgminer -k lyra2z -o stratum+tcp://xzc.suprnova.cc:1596 -u USERNAME.x -p x -I 18
i have added the intensity setting, but it still crashes (error is -11 not -1, sorry)

What AMD drivers are you using?
You sure you aren't mining something when you run sgminer? It works on all my rigs just the speeds suck.