I ran gnome-control-center from a terminal and clicked on change background and immediately got a segfault. Nothing shows in the terminal except 'Segmentation fault'.
I found the following in syslog: kernel: [ 3943.042104] gnome-control-c[4050]: segfault at 9612000 ip b68d9159 sp bfa1ea60 error 4 in libgdk-3.so.0.1000.7[b68b3000+ac000] -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org