So, to make sure that IE can use ExternalInterface:
- To get a reference to the flash movie, it shouldn’t be inside a form. If it must, in the case of .NET or Qcodo, use the solutions found at http://www.adobe.com/go/kb400730 OR use the swfobject.getObjectById function to get a reference.
- Update to the latest version of SWFObject (at time of writing this is 2.1) to place the flash in your page.
- The flash file must be visible on the page
I’ve placed the last point in bold as nowhere on the web was this a documented fix. I assume Internet Explorer might think this is “security” feature. I was displaying a modal window on top of the flash, which hid the flash from view as the flash can appear ontop of the modal window if the wmode parameter isn’t set to transparent.
The modal window needed to interact with the flash file, but couldn’t in IE because it was hidden.