Piece missing out of background image.

A small rectangle is inexplicably missing from this texture. To be more specific, the colors within this rectangle are missing... instead it is all white.

The texture is 4096x2048. The problem does not happen with smaller textures.

The texture has an alpha channel. I'm trying to determine if the problem is with gamemaker or with how photoshop is exporting the image. If you can think of a way for me to view this image without transparency, let me know. The texture is marked used for 3d.

I'm using GMS1.4.1804 on windows 7.