My YouTube video is only showing now in low resolution

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My YouTube video is only showing now in low resolution CoolKarmaVideos 4/20/10 7:16 AM
My YouTube video http://www.youtube.com/watch?v=HE26SUkarwI use to have an option for HD -- which enabled the viewer to read the chart data on the screen.  While my other videos seem to have converted to the newer resolution options and have 420 or 720+ options to selectrion, this one seems now only available in low res.  I am wanting to link this video to an upcoming publication but not at this video quality.  Plus I really don't want to loose the comments and viewers to date by deleting this one and uploading it again.

Any suggestions?