EndNote PDF Viewer highlighting malfunction

I’m currently working on a literature review assignment for the lab that I’m a part of and when I try to highlight sections of articles, after a time or two of opening and closing EndNote, I get the following breed of errors: (See attached file)

this happens to all of my PDFs; as one can imagine when working on a publication, this is madly aggravating. Is there any fix for this?

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: 


Thank you,

Meredith M. 


Thanks for your response. This is occurring for me even on OSX El Capitan (10.11.4). I have not yet upgraded to Sierra for the sole reason of needing to use EndNote in various capacities. Has this been documented for previous OSX versions outside of Sierra? Should I just wait until EN X8 comes out? Thanks again.

Hi @jgstren,

I have not heard of this as an issue for El Capitan users with X7. If you can, I’d get in touch with our Support team to see if they can help: http://endnote.com/support

Thank you,

Meredith M.