Did not work. Sorry Ivan. All I wish to do is add my support to Damien Vincent's original post, saying that nothing, absolutely nothing, has been able to restore normal sharing after update 1703. I am very familiar with every normal setting that is required for sharing, but after 1703 none of the regular settings, the whole shebang of them, are able to restore sharing. All I'm able to do is cast to device and nothing else.
Nothing will make my WDTV read my pc. Just the constantly spinning arrow when network source is selected. And that is something I have ALWAYS been able to fix, many times. Funnily enough, usually occurring after Windows updates where sharing settings were negated/lost. Even if I was able to restore sharing, I'm fairly certain I would be unable to share a solution here as I have tried every single thing so far, so if sharing was restored, I bet I would not be able to identify the cause.
My feeling is that 1703 destroyed a necessary Windows service, and that would not be a first for an update to do that. I had that happen on an earlier pc, a few years ago. Even researching the services required for sharing leads to ambiguity (a lack of consistency), because the available information about the services required, even the names of the required services do not match those that are present on my standard 10.2 Windows build. Not good. I still have every faith in WDTV, but not in Windows and its updates. (I can't even roll back in my case).
So far, Windows updates have cost me a redundant brand new Buffalo Linkstation and a previously fine WDTV. Several hundred pounds of hardware rendered useless.