Accessibility and Apple Voiceover

We have been testing the accessibility of Storyline to decide if it can be used for large scale projects at our institution. Microsoft Narrator appears to work well as does JAWS. However our testing has shown that Apple Voiceover on Macbook can't read the Flash version of the project, the Voiceover just reads "empty html content" when it is running in either Safari or Firefox.

Is this a known issue or are we doing something wrong? Attached is the sample Storyline file we have been testing with.

On a related accessibility note, we have been embedding closed captions into Quicktime movies and these works great in the HTML 5 version of Storyline, however it does not appear that is a way to turn captions on and off in a video in the Flash version. Is it possible to turn on closed captions in the Flash player or would it require developing a custom Flash video player with a closed caption button?

Thanks in advance for any and all feedback!