A family of Microsoft word processing software products for creating web, email, and print documents.
I'll add another +1 to this thread.
I had been holding off updating to 2016 but did it this week and ran into this issue today.
Files opened from O365 SharePoint sites sync'd with OneDrive for business won't open when based on templates that reside in said site/sync'd folder.
Opening the template first and then opening the document does however work (but really not a long term workaround).
SB