EndNote PDF Viewer highlighting malfunction

Hello @jgstren,

If you updated to macOS Sierra 10.12 and are using EndNote X7, that is likely the issue. You can read more in my post here: 

http://community.thomsonreuters.com/t5/EndNote-General/Attention-Mac-users-X7-PDF-viewer-and-Sierra/m-p/131762#M25351

Thank you,

Meredith M.