I'm trying to export a triangulated .obj file with v, vt, vn, and f, but it never exports it's vt data, and I really need it. I've tried pressing the buttons down on the final export menu, and also tried adding both textures and materials to my test mesh, and I still get 0 vt lines.

blender usually starts up bringing the main graphical interface and a black console window. Errors in the scripts that perform the export are usually displayed in this console.

Whether an error or not is displayed try to google for .obj export errors with blender and see if the version of blender (or the version of the scrip) you are currently using has some sort of problem.

Sorry if not enough, but can't say much without further information.