Egg stopped developing?? Help!

[Lavkid]

So I received an egg, put it in the bator that's been proven. Did my normal routine and now on day 20 after lockdown on day 18 nothing. Day 23, nothing. So I took out to candle and it's 3/4 dark and had a normal looking pocket. Why did it stop developing?? Can I leave it in longer and hope it continues? Or is it dead....

 

[Kiki]

A million things could have happened.
Here is a good starting point to read about a few common things:
http://extension.msstate.edu/content/trouble-shooting-failures-egg-incubation#LD

What exact temps and humidity level were you running the bator at?

 

[Lavkid]

100 and humid 45. I've done this with other batches and was successful

 

[Kiki]

100 and humid 45. I've done this with other batches and was successful

Parent stock plays a roll too.