I just installed Draftsight and tried to open one of my .dwg files.  The file evidently opened, but I cannot see it in the drawing window.  If I try to open it again, I get the message that it is open. I have set the zoom to "all" and then "fit", but it still doesn't show. If I select the entire drawing area, the drawing shows up with the object selection squares on each object.  Of course, I can then see the drawing, but can do nothing with it except copy, delete, etc.

Can anyone tell me what I'm missing?