If I understand correctly, the problem is only with linked DWG files. In the view where you have placed the DWG file (including every instance where it's been copied and pasted throughout the project after the initial link was made), click once on the DWG image. Look up at the top right hand corner of the screen and you'll see a pull down menu with either background or foreground showing. By default this is set to background every time you link in a DWG. It will not show up when you print. That is also why changing the view settings to wire frame works. You see "through" the blank sheet. Just set the toggle to foreground instead of background for each imported DWG and you'll be fine. Also, when you reload we have had trouble with this setting reverting back to background, so be weary. The wireframe setting may be the way to go if you don't want to have to worry about resetting the toggle each time you reload.
