OpenSesame experienced a major incident on January 19, 2026 affecting Simon Learner Experience and OpenSesame Course Delivery Platform, lasting 13h 52m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Jan 19, 2026, 03:45 PM UTC
We are investigating an issue preventing learners from launching TED courses. Affected users may encounter an error message stating that the video is not loading when launching a Simon TED course. Our engineering team is actively working to resolve this issue. We apologize for any inconvenience. Please reach out to our support team with any questions or concerns.
- investigating Jan 19, 2026, 07:07 PM UTC
We continue to investigate the issue with TED courses not launching. We apologize for any inconvenience. Please reach out to our support team with any questions or concerns.
- resolved Jan 20, 2026, 05:38 AM UTC
TED has informed us that the source of the issue has been identified and fixed. We are able to confirm that videos are now loading properly in TED courses.