chrome acting weird on my computer alone

I have made a html 5 video in easy html 5 video maker (used camtasia to record the .mov file and then imported mp4 to easy html 5). Easyhtml5 has fall back for (mp4 mv4 webm and swf) and imported into a xara page with problems. In all browsers (FF IE safari and opera) it shows the rotating 3d pie chart with a white back ground as it should but in chrome it shows grey the size of the placeholder? The customer support for the programme have seen the page on the members site and it has a white back ground in their chrome (same release) and my web hard ware geezers at work see the same white BG in chrome for that page and more weird they see the white back ground when on loginme in on my computer and i see it still grey!

So far work geezers have re installed my graphics card drivers and disabled all plugins, re installed chrome but no change. The geezeers guessed that perhaps chrome was using the wrong codex some how but they were stumped... but they did use inspect element in chrome and found the webm was white bg but both mp4 files when hovered over showed grey hence the codex thought?

Any one any ideas?

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Scruffy