PowerPivot for SharePoint - Browser Refresh Fails (Data Refresh not supported in Office Web Apps)

We have been seeing Excel Services/PowerPivot data refresh issues using SharePoint 2013 and Office Web Apps (OWA).  Some customers have been running into issues when attempting to refresh data in a PowerPivot workbook on SharePoint 2013 using OWA server, and are seeing errors similar to the following: "PivotTable Operation Failed An error occurred while working…

20