iBeacons will not appear until restarting phone

Originator:eli
Number:rdar://17713727 Date Originated:17-Jul-2014 02:22 PM
Status:Open Resolved:
Product:iOS Product Version:7.1, 7.1.1
Classification: Reproducible:Sometimes
 
Summary:
When working on ranging for iBeacons, we've noticed that multiple phones, ranging from the iPhone 4s to the iPhone 5s have issues ranging for beacons and getting data back. Calling `startRangingBeaconsInRegion:` will work, but nothing will be returned from delegate calls for `locationManager:didRangeBeacons:inRegion` or `locationManager:rangingBeaconsDidFailForRegion:withError:`. While this bug is not consistently reproducible, out of the 10 devices we've been testing it on, it has occurred for 2 devices already.

Steps to Reproduce:
1. Create CLLocationManager
2. Create CLBeaconRegion
3. Be in range of the beacon/beacons
4. Call `startRangingBeaconsInRegion`
5. Observe beacons or error

Expected Results:
Beacons will be returned in `locationManager:didRangeBeacons:inRegion` or a failure from `locationManager:rangingBeaconsDidFailForRegion:withError`.

Actual Results:
No callbacks from either delegate method, but beacons will appear after rebooting the phone.

Version:
7.1 and 7.1.1

Notes:
The reboot often solves the problem, but telling our users to reboot is not an optimal UX.

Configuration:
iPhone 5s, Verizon, 16gb on WiFi, iPhone 4s, AT&T, 16gb on WiFi

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