Some Mac users have reported not being able to see scroll bars when accessing the Grade Centre, which means that they have been unable to find the correct column for marking. This is due to a setting in the Mac operating system and can be rectified by following these steps:

• Click the Apple menu at the top-left of the screen, then select System Preferences.
• Next, select the General preferences pane; it’s the very first one, up at the top.
• Under the “Show scroll bars” heading, you’ll find three options: “Automatically based on input device,” “When scrolling” and “Always”.
• Select Always.