Update on the VM problem I posted above (2016-02-26 19:33:53.292635): I found a problem with the VM guest kernel modules, and reinstalled those under 4.4.2. Graphical login screen does work now, but "Gnome on Wayland" sessions do not.
The graphical login screen runs in to an error and shows a grey screen with an "oops" message and a "Log Out" button on my virtual machine (Parallels Desktop 11.1.3). Had to boot in to 4.3.5 to be able to use graphical login.
On another machine (ASUS Zenbook Pro UX501), the login screen appears but behaves strangely when logged in to a Gnome Wayland session. Terminal windows do not show a prompt. If a standard Gnome session is used, terminal windows work normally.