Here is the offending package upgrade: Start-Date: 2013-06-30 12:15:58 Commandline: apt-get dist-upgrade Install: libgnome-bluetooth11:amd64 (3.8.1-1, automatic) Upgrade: libnm-gtk0:amd64 (0.9.8.2-1, 0.9.8.2-1+b1), network-manager-gnome:amd64 (0.9.8.2-1, 0.9.8.2-1+b1), gnome-bluetooth:amd64 (3.4.2-1, 3.8.1-1), gir1.2-gnomebluetooth-1.0:amd64 (3.4.2-1, 3.8.1-1) End-Date: 2013-06-30 12:16:02
Reverting those changes results in gnome-shell loading again. Gnome fallback appears unaffected by this issue.
