Actually I found the solution and fixed the problem. It's an Excel update from 12/13, KB2596596. If you remove this update, the charts print exactly as they should--and as they did at the beginning of December.
Mystery solved. Case closed.
I have a sheet with several graphs which I can view in Print Preview. When I print the graphs, all the text disappears! I have no text in the title, the axes, or the legend. The legend and graph show triangles and squares for data points on the Print Preview version but in the actual print...