This is just to make a not of a fix that seems to work and may be useful for other problems where something in EE suddenly stops working for no obvious reason. First, try **Ctrl+F5** to ensure that your instance of EE is at the latest version. If that does not fix the problem then do **Ctrl+Shift+Delete** In the window that opens: Time range to clear: `Last Hour` Click on **Details** Untick all options. Tick `Offline website data` Click on **Clear Now** Then press the F5 key to refresh the browser window. I'm not sure but you may also need to close then reopen EE and possibly logout and back in again.