Audio failure (mute) - On iPad using AMP from a web server

We are publishing our programs using Update 5 vs. Update 4. 

Our programs are primarily video containing audio, imported into Storyline.

We are finding that some of our programs now published with Update 5 vs. 4, there is no volume or audio coming out when the videos played. With Update 4 publish they are fine.

These course are published to a server and played from iPad using the AMP.  So the audio is like it is MUTE.  Anyone else experiencing this problem?

I am testing on the newest iPad air.

Thanks

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