If you are using Internet Explorer as your web browser, you may encounter a “windows security” pop-up or “protected view” issue when opening word documents from your Moodle courses. Please note that Firefox is the most compatible browser for use with Moodle. This issue does not occur when using Firefox, Chrome, or Safari.
Are you seeing this?
If so, it is because you initially “opened” the file instead of saving it. When you click on a file in Moodle, Internet Explorer opens a window with three options, as seen here:
To avoid the security pop-up, always choose “save” or “save as.” Once the file has saved, you can open it from the bar at the bottom of the screen: