One thing to check would be the console in your browser’s development tools. As widgets are JavaScript based, you may find an error message in there that may explain what is happening.
Good luck!
Unfortunately, the console does not indicate any errors (both application console and deveoper console widget) related to this widget. For a few, a message like this appears
but it applies to other widgets
I am sure there is something wrong with the application itself. I've created a new clean project and the widget is working fine there.
Perhaps in the course of the project, and I've been sitting on it for a long time, something has changed and now there are adventures?
I'm wondering if it's still possible to 'reset' something within this widget other than the fact that it has been removed from the widdgets folder. Perhaps there is a conflict with another component? Or (although I doubt it), some CSS style? (although I'm only using Atlas' standard settings).
I ran into the same issue. Turns out, the user role didn't have read permissions for the data source value attribute in the rich text editor. Once I sorted that out and gave the role the read permissions it needed, everything started working again.