Material application distortion
I need help with a strange graphic application distortion.
The below image is part of a model from Sketchup. It has a deep cut which is seemingly affecting the way the graphic behaves when applied.

The graphic is exactly the same size and shape as the model (tried as transparent png and jpg), so it should perfectly cover the whole side. Instead it is being distorted by an invisible diagonal line between the bottom corners and the internal curves.
I created a super simple but similar shape to test with with the same results. Any ideas welcome.

Thanks all
