Refreshing your browser can possibly solve the problem. Your internet speed might also be the reason for the malfunctioning. If those two things don't solve the problem, please contact our support department via service@onlineseminar.com.
You can try to refresh your video stream. This solves the problem in most cases.
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The webinar is probably playing simultaneously in two or more browsers. Please close all expandable browsers and continue watching in just one browser.