I just discovered something interesting: None of the accounts on my machine will login with Xorg. The option is offered, but is does not work. For F40, I had selected gnome-classic with Xorg. New accounts defaulted to gnome with Wayland. When I made a new hennebry account, even with an old home directory, it got the default and allowed me to login. I infer that the option is not stored in the home directory.
Not being able to use Xorg is not good news. Last time I had trouble running videos, part of the solution was switching to Xorg. The rest, I think, was installing the H.264 decoder. I found the thread, but it does not tell me the name of the package or the name of the repo. Also, I do not know whether videos will work for me with Wayland.