A family of Microsoft word processing software products for creating web, email, and print documents.
It seems like last update fixed my issue (rel 16.0.6001.1038).
Did it do the same for yours?
Yes! After the latest Windows 10 update, the problem of hanging while opening Word or Excel documents has resolved.
No, the problem has not been resolved. I must have opened a document from my own OneDrive (which works fine) and was too excited to notice. Opening an Excel or Word document from OneDrive accounts shared with me (my boss's, for example) still results in the program hanging. Apologies.
Just adding that opening files saved in Dropbox works properly. Word opens promptly without hanging. So, I would have to agree with other posters that it seems like an authentication problem.