Flash 20.0.0.267 Bug - Cannot download files within Flex App - URGENT!

Our Flex Web application is no longer able to download files for users on Flash 20.0.0.267.

When button is clicked to run...

var fileReference:FileReference = new FileReference();

                    fileReference.save(fileData,fileName);

... they do not get their file picker window.  They get absolutely nothing and cannot pull down the file.

For reference, running on Mac OS...

This works:

Chrome Version 47.0.2526.106 (64-bit)

Adobe Flash Player - Version: 20.0.0.228

This does not:

Chrome Version 47.0.2526.106 (64-bit)

Adobe Flash Player - Version: 20.0.0.267

ref:

private var fileData:ByteArray = new ByteArray();

...

fileData = evt.result as ByteArray;

...

popUpWindowNotice["btnOK"].addEventListener("click", downloadIt);

-----

private function downloadIt(evt:Event):void{

                trace("PopupHistory_AdminDownloads.downloadIt()");

                CONFIG::flex {

                    var fileReference:FileReference = new FileReference();

                    fileReference.save(fileData,fileName);

                }