If you try to use the On Media Timing Event of the Popup version of the Universal Media Player it will work correctly in Reader Mode. However, in DHTML the On Media Timing Event message is never sent to the media player.
This is a known problem with the Popup version of the Universal Media Player, as well as the Popup version of the Flash Player, for which there is no fix currently available.
To work around this issue you can use the non-Popup version of the media player.
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