Report an Issue (See tab at top of this screen) is the section of this forum intended for posting possible bug reports. The issue you describe has been previously reported.
For More Information see: FM12 Save as pdf Issue
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip