I need to call FileReference.save() after a web service call has completed, but this method has a restriction: \"In Flash Player, you can only call this method successfully
I had this same issue, I chose to use flash.net methods. Call flash.net.navigateToURL(url); from an actionscript or navigateToURL(url); from mxml.
flash.net.navigateToURL(url);
navigateToURL(url);