"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 of a mail merge in a Word document, substituting the field placeholders with names, addresses etc from a database:

    Dim w As Word.Application
    Dim d As Microsoft.Office.Interop.Word.Document = Nothing

...

    Dim f As Microsoft.Office.Interop.Word.Field
    For Each f In d.Fields
        f.Select()
        If fieldName = w.Selection.Text Then
            f.Result.Text = value
        End If
    Next

However a user running Office 2013 reports this error on the line f.Result.Text = value:

System.Runtime.InteropServices.COMException (0x800A17EC): You are not allowed to edit this selection because it is protected.

So, this is only happening when the user is running Office 2013 and there's very little online help for this error.

No part of the document is protected, and the user can edit the document directly in Word without any problem.

Answer 1

We had some C# automation that worked fine with Word 2007/2010, but stopped with Word 2013 with the same "You are not allowed ..." warning.

Following steps on this site solved the issue.

Basically there are two settings to check:

• File – Options – General. Uncheck “Open E-Mail attachments and other uneditable files in reading view”
• File – Options – Trust Center – Trust Center Settings. Select Protected View, then clear all the checkboxes.

Answer 2

Tried most of the suggestions above but I found this fixed the problem. We were opening the doc as a template in read-only with a password. So couldn't use 'Add'

Documents.Open(strTemplateDoc, ReadOnly:=True, PasswordDocument:=strDocPassword, Visible:=False)

Setting the View.Type to wdNormalView stopped the error "You are not allowed to edit this selection because it is protected"

wdDocPage.ActiveWindow.View.Type = Microsoft.Office.Interop.Word.WdViewType.wdNormalView

Thanks to all the others for their suggestions - they helped a lot.

Answer 3

In desperation, trawling for answers even in blog posts and discussions far removed from this particular error it seems there's been a change in Office 2013 to the default treatment of the ReadingLayout.

Introducing the line w.ActiveWindow.View.ReadingLayout = False seems to have solved our problem.

Answer 4

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.

Answer 5

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<ContentControl> 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.