I couldn't see the video. It sounds like you are importing a file that is getting wireframe in X4, but no wireframe in X6.
Are you importing these models from a different format....iges, step,sldprt etc ?
If you are, then go to your configuration in X6 and look under converters. See if the "edge curves" button is checked. It migh be checked in X4 but not in X6
Also, use your screen/ statistics drop down to seen exactly what entities are on your screen.....