“You are not allowed to edit this selection because it is protected.” but only since Office 2013?

Question

We\'ve had these few lines of code running happily in our applications for several years (and in several versions of Office, 2003, 2007, 2010 etc). Purpose is to perform a kind

Answer 1

You don't specify how the document is opened, but a problem I had was resolved by following the answer accepted on this question.

Switching from WordApplication.Documents.Open() to WordApplication.Documents.Add() resolved the issue for my application.