If you are still having this issue, you may want to open a ticket with the Help Center: https://khanacademy.zendesk.com/

Hi SydtheDolphin,

If you're having issues with loading the CS projects, I would first try refreshing the page, since that usually fixes the issue. If that doesn't work, you may want to try restarting your device or switching to a different internet connection.

If you need further assistance, please submit a support ticket and we'd be more than happy to further investigate!