I just tried switching to a terminal via Ctrl+Alt+F1, and I was able to log in with that. From there I entered "sudo /etc/init.d/gdm restart", sudo accepted my password, and now I am able to open Synaptic and gnome-terminal without problems.
I just tried switching to a terminal via Ctrl+Alt+F1, and I was able to log in with that. From there I entered "sudo /etc/init.d/gdm restart", sudo accepted my password, and now I am able to open Synaptic and gnome-terminal without problems.