If you played the lab and your "View Theory" button shows a blank screen or a "token expired" error, it could be that it's a temporary glitch.
Not to worry, this can be fixed quite easily.
To resolve this issue, please try the following steps:
If the issue persists, try to restart the lab from the beginning.
Please do not hesitate to reach out to our support team if you have any questions or are in need of assistance.