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
For me, the issue was similar to Tim Dols answer, but I needed to unlock the content of the content control., which is the LockContents
property:
mycontentcontrol.LockContents = False
For @CrazyIvan1974, the problem with that solution is that Add creates a new document. if you point at an existing document when using Add, it doesn't load the document, it creates a new document using the original as a template. That can disconnect templates and add-ins, really messing you up if you save over the original