1- Create a course with some activities and sections (more than 5 each if possible). 2- Login as admin and go to the course 3- Turn edit ON. 4- Wait until the page is fully loaded. Then display the course index and uncollapse all sections (you probably need to close the drawer for it). 5- Edit your config.php and add the following code: if (defined( 'AJAX_SCRIPT' )) { sleep( 10 ); } (Note this will make everything go slower if you navigate through the page) 6- Drag one activity on another position (on the content or on the course index, it does not matter). While the action is executing do the following checks (if you don't have enough time to do the checking, simply repeat the action and continue with the next check): 6.1 - Check the element get has a pulse animation (goes from darker to lighter in a loop) in both course index and course content. 6.2 - Check  that both course index and course content element are not draggable. 6.3- Check that clicking in the name in both content and course index has no effect. 7- Now drag one section on a different course position and repeat the same checks as before step 6.