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Is it possible that your video is on a different layer? One that is not visible when the page loads? Though this is strange since you are getting sound.
Usually when Web Designer says the document is already open, it is already open. If you look at the bottom of the Window menu it will show you what documents are currently open. So this my somehow have corrupted your document.
Have you tried deleting the video altogether and then adding it fresh? If you do this make sure the video is on a visible layer.
Let us know if any of this helps or if you need more help.
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