“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

In my case, this error was caused by the presence of content controls with .LockContentControl == true.

To work around this issue, I built an IEnumerable of the content controls with this property set to true, and set .LockContentControl = false. Now I can .InsertColumnsRight() without a problem. Then I restore the .LockContentControl = true for all content controls in my collection.