As the subject states, I switched to GDM after the last update broke some things to lightDM. Switching to GDM (from LightDM) and it appears my gnome desktop environment is slightly different. I am missing the pop-out panel menu on the left-hand side:
It also appears there are some other minor differences with my gnome environment. Are there other changes behind the scenes that happen when you go from LightDM to GDM?