Sorry should have been more clear. My background widget blueprint has one widget in it of type Image. The project I originally tested with was upgraded from 4.5 > 4.6. I also tried it on a new project and the issue remains.
Steps I took:
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Import background image (Note: My image I’m using is non power of 2)
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Set texture properties to UI group and TC_UserInterface2D
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Create unlit material with only the texture in emissive color (use with UI is checked)
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Create widget blueprint with an Image widget item
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Assign the material to the image under brush (Appearance > Brush > Image)
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Play in editor = Shows up
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Play Standalone = Black
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Replace Image with the Texture used in the material. Play standalone = image shows up.
I have tried this with a material with only a color property in the emissive slot and it also shows up blank.