If you are using IE8, editing the thumbnail of a widget document in the XPages-based widget catalog requires a page refresh to see the new thumbnail.
1. Open any widget in the XPages-based widget catalog and click the Edit button.
2. Upload a new thumbnail picture.
3. Click Submit to save the changes.
4. Reopen the widget. The old thumbnail still appears. Press F5 to refresh the browser and display the updated thumbnail.
Resolving the problem
Open the widget document and press F5 to refresh the browser and display the updated thumbnail.