Sometimes, it is possible that some of your course elements (e.g. individual screens) become locked although nobody is working on them. In this case, the course will not become locked, so an administrator will have to unlock the individual course element.
To do this:
1) From the Administrator tab, click on Manage Projects:
2) From the list of projects, click on the spectacles icon to the right of the course that has an element which has become locked
3) You will see the course structure appear on the screen. Elements that have become locked, will display a closed padlock icon to their right. Click on it.
4) A warning will appear on the screen asking you to confirm the action. Click on the OK button to proceed.