Mp4 video does not play properly sometimes

I published a project with a mp4 video on teh first frame. Its set to play when clicked and uses the playback controls.

When i publish i publish for html5 and the mobile player.

I upload it to my server then link to it in Blackboard.

When i click the link it opens the articulate player

When i run it on an 1pad1 it plays fine.

ipad 3 the video is a black box and i can hear the audio playing in the video. If i refresh the screen the plays fine.

How can i get this to run like it does on teh Ipad 1?

What causes this?

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