Quick export question (i hope) for Reader

I'm using the following button created in livecycle:

form1.Submit::click - (JavaScript, client)

xfa.host.exportData("",0);

In Acrobat Pro, I get a prompt to save the file as .xml (desired behavior)

I have enabled the form with "extend features in adobe reader" using Pro and have the 'save as' menu item available in Reader, so I know that is working.

However, when the export button is clicked in Reader, it flickers and does nothing.

Any ideas on this one?

Thanks!