Video files not playing in published to CD

Hi All, Just published to CD  a demo version of A course containing mp4 files. Everything works fine except the video file components do not show on screen. I can see  finger icon as I hover where the video is meant to be but visually just blank white screen where videos should be.

Anyone come acorss this issue before? This was published using storyline 2. I'm guessing it could be due to flash compatibility with browsers?

Thanks,

Loc

 

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