Maybe it has, but that doesn't help people running older OSX versions. But, I have figured out what causes it (at least in my case, and I suspect what is going wrong in the framework). It is using the navigationDocument(fileUrl) with a url that doesn't exist (which happens during rename, or even save of an untitled document). That causes the toolbar to disappear. You need to ensure the fileUrl provided actually exists. I filed FB20931144 with the details.