When plugging in textures and trying to view them in Maya’s viewport, sometimes you’ll notice that there are transparency issues. The shaded looks fine, even the render, but when the texture view is on (whether you’re on default, high quality, or viewport 2.0), you get the image below.
This seems to happen when you have a texture with transparency (the alpha gets plugged in automatically in the Transparency slot when using standard materials upon plugging in the diffuse) and you don’t have Polygon Transparency Sorting on.
To fix this, go to the viewport, Click on Shading and check Polygon Transparency Sorting.
Your model should render fine in the viewport with transparency after turning on this setting.