Random question marks in boxes
Hello,
I've been having an issue whenever I create or edit a PDF document. All of a sudden I get these question marks inside a box randomly all over the text throughout the entire document. It has been hard for me to figure out what causes this. But, I have noticed that it mostly happens when I insert another pdf file into the document I am editing/working on. I'm working with Adobe Acrobat XI Standard, version 11. Could you please give me some instructions on how to solve this? Many thanks in advance
