I'm reading a PDF file and using Text Highlighter in some sections, using two differents colors of highlighter and when I try to save the file, the Dialog Box "Save as" just stay in white and nothing appear... I've tryied send it with Outlook, but doesn't work... And it's happening with other files (not all of them, maybe one per 10 files) when I use Text Highlighter... Why does it happen? (Sorry for my english level)
Sorry for the delay in response.
Try troubleshooting steps suggested in the link below:
Have you tried saving pdf file using Save As option without highlighting the pdf, does that work?
What is the version of Acrobat Reader/Adobe Acrobat installed on the machine?
You may refer to this link for the same: Identify the product and its version for Acrobat and Reader DC
Keep us posted with the results.