I was eager (maybe too eager) to see what's new in iOS 8 so upgraded my iPhone 4S few days ago.
Shortly after upgrading I noticed the battery is being consumed at a crazy rate (1% every minute, I could actually see it decreasing while it was just in lock screen) so quick panic Googling took me to this excellent article which indeed saved my poor battery.
I took all the steps desribed in there, and apps like WhatsApp still have push notifications like before, however Stack Exchange (beta) app stopped pushing them. No push, not even the number on the app icon. When inside the app itself the inbox contains the new items properly.
Since it's only specific to SE app I'm asking here and not in https://apple.stackexchange.com/ - what can cause this? I did not change the Notifications settings:
However this can't be a coincidence and something I changed to preserve battery caused this, so hopefully someone who is more familiar with those things can come up with an idea what I'm missing.