TutorMandarin Virtual Classroom FAQ Can’t see the tutor’s video Tutor side: Check if the camera works properly Check for an issues with thislink: http://api.duobeiyun.com/ittest/content.html?result=CALLBACK_URL&lang=en&uid=123456&KEY=VALUE Check if there is any other program using the camera Check if the camera works successfully in other software (skype, qq, etc) Student side: Check if the network connection with the[…]