I got it to work just about the same time you send me the project files. I've added a few lines to config.xml and set the plugin versions to the same as yours and it started working. Also tested your build and it's also working.
There is one more bug dough. Mp3 files from S3 aren't playing and that is either through the native <audio> tag or your S3 plugin. The native audio files are in the description of the course. The player shows but nothing's happening if I click on play. It's the same with S3 (though this one is going through course video S3 plugin) and is visible in units.
Can I get some more help here?