I have been using MovieMaker to upload to Youtube for years. I've uploaded hundreds of files (https://www.youtube.com/user/mcoperahouse/videos to see them.

Now suddenly I now get this error: "Your movie wasn't published because there was a network problem. Please check your network connection and try again."

Of course this message has nothing to do with the problem. I have a perfectly good internet connection.

Since it's excruciating to have to wait until the movie is done saving and uploading in order to get the error, I create a simple project with one photo in it, to test. I get the same error when I attempt to publish it using MovieMaker.

So I save it as a movie in the recommended format, which creates an mp4, and then upload directly to Youtube (using the Youtube upload button) and it works. Why can't I publish using MovieMaker?