Error code -600

In summary, I cannot get MS word and Endnote to work together at all. I am running MS Word 2011 (14.7.7) and Endnote X7.8 on OS10.12.6. Clicking on anything in the Endnote menu of Word brings about the error code of -600. All of the Cite Whie You Write buttons are also greyed out in Endnote. I just spent 35 minutes on the phone with technical support uninstalling and reinstalling a variety of different things, and I let him move on to the next customer while I tried what he suggested (update Word from 14.6.0 to 14.7.7, both have issues), but surprise surprise, still nothing works.

Any other ideas/suggestions?