CSV importer does not show status (JSF UI)

This works perfectly in 8.2:

• upload of CSV file via rich:fileUpload widget completes
• status updates every ten seconds
• summary is shown when import is done

In 8.3 regressions begin:

• fileUpload completes
• status does not show
• summary is shown

In 8.10:

• fileUpload does not complete
• Uncaught TypeError: Cannot read property 'childNodes' of undefined error displayed in JS console
• status does not show
• summary does not show (no indication that import is complete)(summary does display if Cancel is clicked and Import CSV button is clicked again)