I've had 2 pips die. They pipped on time and seemed to be doing OK. But in both cases a little liquid (albumin?) and possibly yolk oozed out of the egg. Both chicks died with their beaks in the pip. And the liquid dried around the pip and set up like glue. I'm not sure what occurred first. Death or the albumin setting up. I did a post-mortum on both. In both cases the air cell membrane was unbroken above the chick. All the eggs in this batch had air cell problems from shipping. I'm guessing that has a lot to do with it but don't kw for sure. After candling on day 18 I was worried about them having trouble with the because of the air cells. So I'm running at about 85% humidity to prevent the membrane drying out. The air cells were larger than expected and had irregular margins. Did I screw up? Man I hate loosing them this late in the game.