This
could be due to one of two issues:You’re not using the latest version
of Adobe Acrobat Reader to view the PDF. You can download it for free here (it’s available for both Mac or PC). Once you
download and install Reader, open the PDF again.You’re using a Mac, and your default
PDF viewer isn’t Adobe Acrobat Reader. Macs use an application called Preview
by default, which may not work 100% with all PDF files. See the question below for
steps on how to open a PDF in Adobe Reader instead.