White Noise was broken by the OS v2.2 firmware update. We have fixed the problem and the latest version is available on iTunes. White Noise and White Noise Lite have both been updated and are available.
What's was the issue?
Apple changed the default behavior of 3rd party applications to no longer play sounds when the screen is locked. Apple gave no notice of this change so we had to scramble to get an update out.
Cheers,
Todd