Recently did a clean install of 13.10, everything was going great. Then I installed the new Cinnamon 2.0 Desktop from the PPA. When I logged in, it seemed to work (except that it didn't register touch's on the clickpad as clicks). Afterwards, I logged out of Cinnamon to log back into Unity, but it immediately crashes back to the Login screen. I can log into GNOME flashback without issue. I've removed Cinnamon, but the problem still persists.
I actually got it solved like this