Issues with Arabic in Mac OS X with Flash 10 / Flex Gumbo

I've been looking at converting an existing Flex 3 project to have an Arabic language version, so I have been looking at the TLF to help do that. Originally I intended to just use the components for using TLF in 3.2, but it looks like I may need to use Gumbo for font embedding.

I'm using the TextFlow to create an editable input box and so far I've run into a number of odd behaviours; can anyone explain where I might be going wrong, or an easy workaround?

This is the code I've been playing with as a test:

<code>

private static const textInput:XML = <TextFlow xmlns="http://ns.adobe.com/textLayout/2008">
                            <div><p><![CDATA[اتحاد الصحفيين العرب يدينس]]></p>
                            <p>\u064A\u0648\u0644\u062F \u062C\u0645\u064A\u0639 \u0627</p></div>
                             </TextFlow>;

[Embed(source="./fonts/AdobeArabic-Regular.otf", fontName="Adobe Arabic", cff="true")]
private var arabicFont:Class;

private function initApp():void
{

    var textFlow:TextFlow = TextFilter.importToFlow(textInput, TextFilter.TEXT_LAYOUT_FORMAT);
    textFlow.direction = Direction.RTL;
   
    var cf:CharacterFormat = new CharacterFormat(textFlow.characterFormat);
    cf.locale = 'ar';

    cf.ligatureLevel = LigatureLevel.EXOTIC;

    cf.fontFamily = "Adobe Arabic";
   
    cf.fontLookup = FontLookup.EMBEDDED_CFF;
    textFlow.characterFormat = cf;
   
   
    var sprite:UIComponent = new UIComponent();
    sprite.x = 20;
    sprite.y = 20;
    sprite.width = 200;
    sprite.height = 100;
    var controller:IContainerController = new DisplayObjectContainerController(sprite, 200, 100);
    textFlow.flowComposer.addController(controller);
    textFlow.interactionManager = new EditManager();
    textFlow.flowComposer.updateAllContainers();
   
    addChild(sprite);

}

</code>

I've found I've had to use the cff embedding to have the font showing correctly and also not garbling the characters. However, even with cff embedding on, I've found that Mac OS X keyboard inputs come out as garbled roman characters rather than Arabic.I'm sure there are examples of Arabic working in OS X though - is there something particular about how I'm setting up the TextFlow that could be causing this problem?

Thanks in advance for any responses.