What changed from 3.9 to 3.10 to break this example: Default editing widget | ArcGIS API for JavaScript
If you go into the sandbox and change the references to 3.9 the example comes back to life. My application has similarly broken under 3.10 using very similar code to this example.
Other editor examples are still working under version 3.10. So is there a problem with the example that I'm not seeing?