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When the course video is not available, you can try the following methods as follows: 1. Refresh the course page 1 - 2 times and you should be able to play the video of the course smoothly. If you have the same status on other course pages, please "reorganize" again. 2. Go to "Settings" > "Advanced Settings" > "Privacy Settings" in the browser and delete the cookies to solve this situation. If the course video is too slow to load or the viewing is not smooth, you can try the following five ways to improve: 1. Slightly lower the "resolution" to watch the course 2. Check if the local network environment is good and you can change the network environment. 3. Clear browser cache 4. Change browser (Chrome, IE, Safari) If you are unable to watch the video at all, it may be in the network environment, there are restrictions on blocking external services (such as in the company's internal network), so please change the network environment or contact the network administrator for assistance. solve.