On September 16th, 2015, the IMA HTML5 SDK will change how it handles custom playback. In order to provide a more seamless ad experience, custom playback on Android 4.0+ devices will be disabled.
As per a previous change, the SDK only selects custom playback when necessary. Since Android 4.0+ devices support standard rendering, it is no longer necessary to use custom playback on these devices.
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If you have any questions about these changes, feel free to contact us via the support forum.