Can you confirm the verion of the operating system and browser you are using.
Also, can you list the steps you are taking to create and export the videos you want toupload to YouTube?
Certainly you can. Simply use the drop-down list at the top of the Publish dialog to select Video.
The default is HTML5/SWF, but the next one under that is VIDEO, that is MP4.
So all you really need to do is publish to MP4 and then manually upload to YouTube via their website.
One thing though, this option is NOT available for Responsive courses, and you lose all interactivity (so no quizzes). But you probably already knew that.