I live just outside Philly, and it’s 2 PM here, so not sure when you’re going to hear. But I’ve been a long-time EndNote user (since version 3 or 4 I think) and previous beta tester, and I can’t think of any version in the past that was as unusable as the current version. It’s not just with Word (and yeah, MS has some blame there probably). The EndNote app itself slows down massively and tech support has never provided any solution-they just attribute it to a PDF rendering issue with Apple. But I’m an Appleseed tester as well, and that’s never been seen outside of EndNote 8 to the best of my knowledge. So I’m not clear what is going on.
Were I not wedded to EndNote with a library compiled over many years that I don’t want to mess up, I’d ditch it in a heartbeat. They were very slow to respond to new versions of Office, macOS, etc, and after awhile that becomes something I’d rather not have to deal with anymore. In the old days, the folks at Thompson I dealt with as a beta tester were old fashioned and a bit stodgy (I mean, if you didn’t find a bug, you didn’t get a free beta; that sort of nonsense). But at least the app worked well. Now, not so much.
So my advice: at this point, while I’m using Word 16.10 just fine, EndNote itself has significant issues and I can’t recommend it to anyone since it’s unclear that TR will ever make it work the way it should. Just my gut feeling.