Sorry for the delay in getting back to you. You can download the Dependency Walker here, then install and run it. Opening Scrivener's .exe file there will create a list of all the libraries it loads on your system. That might give you a clue to what's causing the conflict.
Before that, one thing to check for that I didn't think of earlier is plug-ins or extensions you might have installed--which it sounds like you just mentioned, re: Office. Since this isn't a typical problem with running these programs side by side on Windows 10, I don't think it's a conflict between any of them directly, but a plug-in might be complicating things. If you have any, you might try updating, disabling, or uninstalling them to see if that makes a difference.
Incidentally, you mentioned both Office 2016 and Office 365. Are you working with the subscription version or the one-time purchase version?
I'm so thick. I keep missing that there's a second page to the responses on this thread. Thanks, I was about to give the whole thing up as a bad idea.
The Office edition is a Uni download of Office... so I'm not sure exactly what kind of subscription it is. The group of Office progs comes under the title of 365 but I know the version of the various apps is 2016.
I decided that, since no one else has reported problems like this, it must be due to some fundamental conflict in my system. So, I backed everything up and reinstalled Win 10. I have only installed a few other vital apps, including Scrivener 1 and Beta 2.9.2 No problems to report so far. I will have to install Avid software again soon and we'll see what occurs after that.