SharePoint PowerPivot Data Refresh - Can't Open the Workbook Because it Uses Unsupported Features

Trying to run the SharePoint PowerPivot Unattended Data Refresh errors with: "We're sorry. We can't open the workbook in the browser because it uses these unsupported features: • Comments, Shapes, or other objects"

Use this tool from: http://blogs.msdn.com/b/cumgranosalis/archive/2007/06/29/excel-services-compatibility-checker-download-page.aspx

to fix the workbook.