some of the characters are displayed incorrectly in some documents. The latest version of Reader DC is installed on the PC. The same document opened on another PC with the same version of Reader, will display fine. Where could be the problem.
Comment review and collaborate PDF, General troubleshooting
As you have mentioned above, some of the characters do not display in the document. The same document opens fine on another machine. It may be a font-specific issue. However, we cannot confirm without checking the document.
Please check if all the fonts are embedded in the PDF. Open the PDF and go to File > Properties > Fonts.
Would it be possible to share the PDF with us and check it on our end?
Also, share the Reader and OS version installed on the machine.