Nearly all issues with pages, quizzes, etc. not loading are due to the web browser holding on to "old" cache/temp/cookies files commonly called "browser history". Clearing out these old settings and reloading the browser will likely fix the page error. If not, contact Technology Services for additional troubleshooting.
These sites can also be used to test for outages or see if others have reported outages. They can be used for multiple websites...