iOS 8 Today Extension not working on device

Question

When I run my Today Extension on the simulator everything works fine and it displays the following as expected:

Answer 1

I had an issue using custom ViewController in my Share Extension. It turns out that the resources are limited in Extension mini-apps, so when my Extension was generating thumbnails, it crashed the extension because too many background threads were being used. Reducing thumbnail generation to a single one at a time fixed the issue.

The confusing part was that this limitation was not seen in Simulator, only on a real device.