We are currently experiencing cases of no grades for videos, quizzes, tests, web pages, and insect-eating materials in chrome.
We apologize for any inconvenience this may cause you.
Specifically, the latest version of Chrome, 73.0.3683.103, seems to have changed the specification of the browser in the part related to the data communication when the X button is pressed on the teaching material screen, and we will adapt the system to the latest specification of Chrome.
If you are using a browser other than Chrome (Edge, Firefox, safari, IE11), this problem does not occur and you can use the site as usual. If you need to learn quickly, we apologize, but we would appreciate it if you could use another browser.
We will take urgent action, but it may take a while to complete.
We would appreciate your understanding and patience.