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Video playback can be affected by temporary issues with an internet browser's cache. If you are having issues watching just one video, but all others work fine, try clearing your browser's cache. It may seem silly, but it's an amazing fix in a number of situations. Try clearing your browser's cache and restarting your web browser.
More Info for these and other browsers: http://www.wikihow.com/Clear-Your-Browser's-Cache
Sometimes different browsers can cause problems. If you're using Firefox and your video doesn't play, but things are hunky-dory in Chrome, let us know! We'll be happy to dig deeper with you.
Related Article: Troubleshooting Course Video Issues