Ran into a weird issue printing emails today to PDF format.  Once the PDF was created it was actually just a text file that has some text that looked like this:

Cambria not found, using Courier.

%%[ Error: invalidfont; OffendingCommand: xshow ]%%

Turns out this is a fairly well known issue and one workaround that enabled us to print was to change an option in the Printing Preferences of the Adobe PDF print driver.  All you need to do is to uncheck the “Rely on system fonts only, do not use document fonts”.  We have not fully tested the impact of this yet, but at least we were able to get our job done.