Weird Stuff with Embedded Fonts

After several hours trying to find why embedded fonts didn't work in my application any more (they were working fine) I found the source, something that looks like a bug.

If I add a spark component, like a textarea, to the display objects list, the embedded fonts don't work in a textFlow / ContainerController / EditorManager setup. The embedded fonts work on all spark components but the sprite container controlled by the TextFlow.

Any Ideas?

BTW, this is how I'm embedding the fonts:

package
{
    import flash.text.Font;
    import flash.text.engine.RenderingMode;

    public class RockwellFont
    {
       

        [Embed(source='assets/fonts/rock.ttf', fontName='RockwellV', mimeType='application/x-font', embedAsCFF="true" )]
        private static var standardF:Class;
       
        [Embed(source='assets/fonts/rockb.ttf', fontName='RockwellV', fontWeight="bold", mimeType='application/x-font', embedAsCFF="true")]
        private static var boldF:Class;
       
        [Embed(source='assets/fonts/rocki.ttf', fontName='RockwellV', fontStyle="italic", mimeType='application/x-font', embedAsCFF="true")]
        private static var italicF:Class;
       
        [Embed(source='assets/fonts/rockbi.ttf', fontName='RockwellV', fontWeight="bold", fontStyle="italic", mimeType='application/x-font', embedAsCFF="true")]
        private static var bolditalicF:Class;
       
       
        public function RockwellFont()
        {
            Font.registerFont( standardF );
            Font.registerFont( boldF );
            Font.registerFont( italicF );
            Font.registerFont( bolditalicF );
        }
    }
}