Just received this information...
CAUTION, iOS Users: DO NOT Upgrade to iOS 9.0 at this time.
Our technology team has discovered that upgrading to iOS 9.0 on iPad at this time may result in a loss of audio events within certain Stride games.
To ensure complete compatibility with Stride Academy on iPad, please refrain from upgrading to iOS 9.0 for the time being. Our team is working diligently to resolve this issue as quickly as possible. We will advise all Stride users when you may safely upgrade to iOS 9.0.
Please note that currently, Stride Academy is 100% compatible with iOS version 8.4.1 and earlier. If you have already upgraded to iOS 9, you can downgrade to iOS 8 by following these instructions.
You may lose audio for certain Stride Academy games on your iPad if you upgrade to iOS 9.0 at this time. Please wait for notification from us when it is safe to upgrade your device.
Be sure to share this important alert with students and parents accessing Stride Academy on their iPads from home. We apologize for any inconvenience, and thank you for your patience.
The Stride Academy Team