Any changes to Microphone class in recent updates?

Hello almighty Unity hive brain,

I have been working on a project for the past year which incorporates the script described here: http://forum.unity3d.com/threads/blow-detection-using-ios-microphone.118215/#post-802891

It uses microphone input to detect the player's breath, which drives the interaction in the game. It was working both in the Unity editor and iOS build until about a month ago. Then it appeared to be working on all devices except the iPhone 6. Now it's suddenly stopped working on all devices, and in the editor as well.

Have there been any changes to the Microphone class, or the way microphone input builds to iOS? I don't see any changes in the documentation. Any help would be greatly appreciated!