Check the Developer Console in your browser for errors when you load the page
Thanks. the error I get is
Refused to display 'http://myserver.com/#/views/myWorkbook/ChartByOrg?:embed=y&:showVizHome=n&:tabs=n&:apiID=host0' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'.
Any idea what this means?
So the error helped me google another person with the same issue. The answer is to remove the # from the URL!
I got it here