When I edit a document using the WebDAV server from IT Hit, I can add content to a Word Document. However if I select it all and delete it all or reduce it down to one word, it then opens as corrupted. In the 2013 version of Word I am able to repair the document. I have attached some screenshot of I came to the error, a before and after repair of the file and how the document looks in beyond compare.
Before
After
The Error
Beyond Compare
Settings Difference
Core Difference