I have seen this problem multiple times and can't figure out. People are opening documents in the viewer and certain text, blocks , features are not showing up on the drawing and when printing. When you look at the part through the viewer those same features are there. They are also there when I open them in normal Solidworks. I have updated their windows fonts and still no luck, why is this happening? what good is a viewer if it can't show the drawing as it really is? Is this a computer problem, not enough capacity?