[Steven Zahm]

@ Charlotte

I suspect that another plugin or perhaps the theme is not limiting their javascript to their own admin pages and this is causing a fatal javascript error which is preventing javascript from running correctly on that page.

To determine this. Load the page in Chrome, hit the F12 key and then click the Console tab. Lastly click the button to start the export. Any errors will be listed in the console. Those errors may provide clues into the cause of the error. If they do not you might have to do the conflict checks:

• How do I check for a plugin conflict?
• How do I check for a theme conflict?

Hope this helps, let me know.