Endnote 7.7.1 issues on MacOS Sierra

I came up recently against highlighting and underlining issues using the Endnote 7.7.1 on a MacOs Sierra.

The problem appears when I highlight or underline a PDF file. 

More precisely the lines I choose to highlight or underline are shown upside down.

Does anyone knows what may cause this problem?

In the attachment you can see a printscreen.

Thank you in advance!

I suspect you want to read this http://community.thomsonreuters.com/t5/EndNote-General/EndNote-7-7-and-MacOS-Sierra/td-p/131332 and http://endnote.com/kb/140624