I am testing some sample webm videos that I got online to see how that format will work in my presentations. I used two of them in a test presentation. I used the html5 widget and selected play until done for the two webm videos in the placeholder of about 12 presentations. Whichever of the videos plays first as part of the entire presentation just keeps looping - in other words none of the subsequent presentations in the placeholder gets a chance to run. Am I missing something here? This is happening when I preview the presentation.