Favorite app has stopped working

UPDATE: Still not working on my 6s. No picture, just black. I dont get it. And I just updated it and the update doesnt work either. Good thing the 6s has improved its lowlight function since this app is complete useless now.

PREVIOUS: Image has just been black for weeks across multiple phones. I use this app often and it stinks that it hasnt worked at all recently. Will change rating when its back to being useful.

HellboyOne about Cortex Camera