Try not to use IE browser when watching online continuing education course. The website says that this continuing education platform doesn't support IE, and you can switch to Sogou browser according to the suggestion of the website, but because of personal preference, according to my personal exploration, Google Chrome browser can also run very well. One more thing needs to be explained. No matter what browser you use, don't open multiple courseware at the same time. The system will only time and accumulate the last courseware.