When you encounter this message, try the following typical troubleshooting steps:
Run Synthesia on the latest version of Google Chrome or Microsoft Edge, on one tab, with no background apps running.
Clear your cache.
To learn more about how to clear your cache see the following articles: How do I clear my cache in Google Chrome? and How do I clear my cache in Microsoft Edge?
Do a hard refresh of the page.
Ctrl Shift R for Windows
Command Shift R for Mac
Try again. If these steps do not resolve the issue, please contact our Support Team.