With this post I sum up my experiences with iOS8 as a developer. If possible I will provide solutions and workarounds.
The release of iOS8 is really unfortunate for me. A lot of my demos have stopped working and it seems like there are some really annoying bugs in iOS8.
Update: Added working example for reachability
Update: Apple confirms bug in iOS8 Simulator regarding backgrounding.
Update: explanation for the NSUrlSession issue found!