TinCan LMS and Articulate Mobile Player Not Reading Configuration

We are working on modifying our LMS to accept Private Content per http://www.articulate.com/tincanapi/ with the Articulate Mobile Player but seem to be stuck because the mobile player doesn't seem to be returning the content_token when requesting files.  The configuration works fine using flash or html5 and reports the users progress to the LMS via TinCan but the mobile app is the last bit we need to get working. 

We are running the latest version of the app (v1.76) and the presentation was made with Storyline v1.3.1305.2012. If we turn the security off the presentation will load but the mobile player doesn't report progress back to the LMS. Looking at our system's logs i can see the iPad's browser making the following request (url encoding removed and line breaks added for readability)

/CourseContent/story.html

?endpoint=http://172.16.13.2/tincan/

&auth=8a98ec72-05eb-4ae6-a957-d9ebddc01b6f

&actor={"name":["Some User"],"mbox":["mailto:someone@somewhere.com"]}

&activity_id=5cmKMKkBte0_course_id

&registration=8a98ec72-05eb-4ae6-a957-d9ebddc01b6f

&content_token=PD94bWwgdmVyc2lvbj0iMS4wIj8%2bDQo8c2ggeG1sbnM6eHNkPSJodHRwOi8vd3d3LnczLm9yZy8yMDAxL1hNTFNjaGVtYSIgeG1sbnM6eHNpPSJodHRwOi8vd3d3LnczLm9yZy8yMDAxL1hNTFNjaGVtYS1pbnN0YW5jZSIgdXM9IjhhOThlYzcyLTA1ZWItNGFlNi1hOTU3LWQ5ZWJkZGMwMWI2ZiIgY3M9ImM5ZmQwNWZlLWZmZDQtNGVlZC1hOGI3LTZlZTc1NjUxOWIxZSIgcz0ieE5vWnMzcjNMaXM2cEd4cGF0YWhIdz09IiB0PSIyMDEzLTA2LTIxVDA5OjI1OjQ3LjMzODI1Mi0wNDowMCIgLz4+

Once the browser opens the iPad Articulate Mobile Player I can see in our logs it making a request for 

/CourseContent/meta.xml

but without the content_token so the security rejects the request. Again if i turn off security I can see it load the files and display the presentation correctly but I do not see any requests back to the provided endpoint.

What are we doing wrong? This setup works fine in browsers and reports home so i feel the configuration is correct but it seems the iPad app just isn't reading the configuration.

Thanks!