When attempting to login with either regular Gnome or Gnome Classic shell/-session by selecting either one of them through the login screen on Ubuntu 17.04 (with latest updates as of November 20th - started a few days ago after a regular system update) it just sends me back to the login screen, but when selecting the Wayland option, it signs me in as usual.
Linux 4.9.0-1-generic #2-Ubuntu SMP Mon Nov 14 21:43:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
When attempting to login with either regular Gnome or Gnome Classic shell/-session by selecting either one of them through the login screen on Ubuntu 17.04 (with latest updates as of November 20th - started a few days ago after a regular system update) it just sends me back to the login screen, but when selecting the Wayland option, it signs me in as usual.
Linux 4.9.0-1-generic #2-Ubuntu SMP Mon Nov 14 21:43:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux