I am taking the Edge Animate Essential 2015 course on Lynda.com. After dropping the video onto the stage, I can't scrub or play back the video within edge animate. The video plays back just fine in the browser preview, though. Yes, I've added mp4, ogg and webm versions to my library panel for this video, and, yes, it was the video "object" that I dropped onto the stage (versus any individual file format). Is there a setting I've missed? The properties panel doesn't reveal anything amiss. Autoplay was selected.