Screen position expression does not work in UMG

Screen position does not appear to work when used in UMG. The Material appears to be one solid color.

1. Open first person Editor
2. Create a widget blueprint
   Right click Content browser > User interface > Widget blueprint
3. Create a new material
   Right click content browser > Material
4. Add a sample texture of the Cross hair
5. Create the Material set up in the attached image
6. Open Widget blueprint
7. Add Image to the designer tab
8. Apply the material that was made to the image that was added
9. Open the level blueprint
10. Add the widget to the view port
11. Play in editor
12. Notice the image in a solid color

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