Random question marks in boxes

[kamcontrols]

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

[Document Geek]

That sounds like a font embedding issue. Check to Document Properties > Fonts dialog box to make sure all the fonts are embedded. If they are not, run a preflight mixup to embed the fonts.

[Bernd Alheit]

Acrobat Standard doesn't have the preflight tool.

[kamcontrols]

All fonts are either Embedded or Embedded Subset. And, it doesn't have preflight unfortunately

[Document Geek]

Please post a screenshot.

[kamcontrols]

This happens randomly throughout the pdf.

[italosan]

It's clearly an issue related to font embedding. Have you tried opening the pdf that makes show up the issue with Illustrator?

[kamcontrols]

Unfortunately I only have Acrobat, so I haven't been able to edit/open the pdf documents in other programs, such as Illustrator. However, it often happens when I add another pdf file to the same document. And, I have found that if I select the text block and change the font, the question marks go away and the text go back to normal, with some spacing/margin changes. But, I would have to do this in every page that has been affected, which takes a lot of time and sometimes I can miss a few of those boxed question marks, which is all not good