On a machine with Excel 2007 installed, open WordPad. Insert - Object.
Choose "Microsoft Office Excel Chart". A generic looking chart gets inserted
into the document. Print it to a printer, and it prints fine (at least for
me).

Print it to the XPS printer (or PDF printer) and you get a black box where
the chart is supposed to be.

This is causing havok on a program I maintain that uses embedded excel
charts. I thought it was a problem in my program, but now I've replicated it
only using WordPad, Excel 2007, and the Microsoft XPS printer.