Microsoft Office Add-in, PDF Maker, suddenly stopped functioning. Reinstalling Adobe did not fix the problem, but I solved it with this quick work-around:
When the "save as" dialog box pops up, select "Quick and Simple PDF," instead of the default "Fully Functional PDF."
That made it work. After doing that once, the PDF Maker add-in started to work again - even with the "Fully Functional PDF" option.