The widgets could also display black screens. This is usually the case when you don't assign any content for the widget. For instance Photos Album widget, for instance Photos Album widget, requires you to select an album to Photos. Photos app.

Click on "Selected Album" and choose an album with at least one picture within it. If you select an album that has videos, Widgetsmith isn't able to perform.

Another trick is creating a new Album' within Photos. Photos app. Open Photos, click on the album tab (bottom menu) Then click the plus icon (top-left corner) and then The New Album tab -> Type in an appropriate name for the album you've created (like "Photos for Widgetsmith') -> Hit Save and then populate the album using photos.

The fact is that you can use this album anytime you create the Photos widget in Widget Smith!