While it is annoying, they do clearly state that you cannot use models from the demo version in the full version. It is frustrating, but I can understand why they do it that way.
In addition they clearly state that you can't post from the demo mode. If you could post, it would not be a demo mode any more (it would be full functioning). If the verify is not working for you, call them and get it fixed. You first best bet is to reload you video drivers, and make sure you are on the most current version of BobCAD:
http://www.bobcad.com/support/updates (again, not the video driver update reminder on this screen!).
The models you have, though, you CAN use (you can copy the layers from the demo program file, and paste it in to a new file made in the licensed version). Unfortunately I don't think you can copy the CAM paths from the demo to the full version. That said, you could save each CAM feature and load it in the full version, but you would need to reselect the geometry and boundaries if you used them.