Maya help -- Transparent textured planes

So I've been modeling and texturing in Maya for a few weeks now for a Unity project and every once in a while when I start to deal with planes they end up transparent. Meaning you can see through the textured planes to the objects behind them. I cannot seem to find anyone else with this issue. I've posted the question in many Maya forums with no responses at all.

I'll post an image of the latest conundrum I've run into. The mesh seems perfectly fine until I add a texture, then suddenly...

Maya help -- Transparent textured planes