iOS 7 CoreLocation：在授权位置服务后，区域监控首次失败

I identified a strange behaviour on my app using CoreLocation. I'm using the region monitoring functionality but, after authorising the location services (via popup or settings->Location Services) region monitoring fails (The operation couldn’t be completed. kCLErrorDomain error 5.). If I close the app and restart (therefore already authorised) everything works as expected. My code looks like this:I identified a strange behaviour on my app usin