So... I have a 16x9 project that I have created in DVD Studio Pro 3. But for some reason when I put the disc in some DVD players, it centre cuts the menus. And then when you click on a button, the feature movie letterboxes. Why aren't the menus recognised as 16x9 and also letterboxed when played on a 4x3 television?
There's a check box in the general settings pane of the disc that says something like "if 16:9 is used...". By default in DSP3 this is set to "Force to Pan & Scan" which zooms the centre section of your 16:9 menu. Set it to "force to letterbox" and it should solve the menu issue.