What version of Inventor are you using?
Are all the Service Packs installed?
What video card do you have?
Are you running in DirectX mode or OpenGL?

Because you are showing a hidden line removed view, you will not see the minor diameter of the threads except from the "top" view of the thread. Threads are not "modeled" when using either the thread tool or the hole tool. Because of this, you will not see "threads" in a hidden line or hidden line removed view. The only way to see the .bmp image of the threads in an idw is to shade the view.