Most of us have had the need to print tickets or documents that we ordered or downloaded from the web. If your computer’s pop-up blocker is turned on, this can cause you to not be able to print. There are also PDF documents that are rights protected by passwords and therefore not printable. 

Tips:
Allow temporary pop-ups. You can find legitimate programs that can break the code in a protected PDF document, but they are usually only legal to use if you or your workplace have the copyright to the document.