If your WordPress widgets have suddenly refused to drag and drop, don’t panic.
- Update WordPress to the latest version
- Update your theme to the latest version
- Update your plugins to the latest version
If you still cannot drag and drop your WordPress widgets it’s because a plugin is causing a problem. You need to find and disable the guilty plugin.
- Disable your WordPress plugins, one-at-a-time.
- Each time, check if you can now move your widgets.
Once you find the culprit, let the plugin author know!