Again, don't panic! Check if your internet connection is stable and empty your browser’s cache. Depending on your browser, methods may differ. Here's a link that will help: Refresh Your Cache.
If the problem persists, please contact us at firstname.lastname@example.org and give us the most details possible about the issue: a screenshot, the action that triggers the problem, the error message, etc.
All details are welcome, so please send the most information possible - we will fix the issue!