Blurring effect disappeared on iOS 7.1

Question

For some reason the blur effect is gone from my app on iOS 7.1. I\'m running the same code on a device with iOS 7.0.x and on another with 7.1. Here\'s what I see:

Answer 1

Probably the second screenshot is taken from an iPhone 4 ? On the iPhone 4 and iPad 2 blur effect is replaced with a simply sample color with transparency.