control center crashes when I try to select Logitech BCC950 webcam sound input

syslog tells me:

 gnome-control-c[6031]: segfault at 7fffe1112ec8 ip 00007fa72cdba9f2 sp 00007fffe1112d90 error 6 in libc-2.15.so[7fa72cd72000+1b5000]

earlier, I got a crash panel that told me I had a vsprintf error, but now I no longer get the crash panel. (by the way, the bcc950 video input works just fine.) more detailed syslog.

Dec 20 19:51:59 iaw-shuttle pulseaudio[5963]: [pulseaudio] main.c: Running in system mode, forcibly disabling SHM mode!
Dec 20 19:51:59 iaw-shuttle pulseaudio[5963]: [pulseaudio] main.c: Running in system mode, forcibly disabling exit idle time!
Dec 20 19:51:59 iaw-shuttle pulseaudio[5965]: [pulseaudio] main.c: OK, so you are running PA in system mode. Please note that you most likely shouldn't be doing that.
Dec 20 19:51:59 iaw-shuttle pulseaudio[5965]: [pulseaudio] main.c: If you do it nonetheless then it's your own fault if things don't work as expected.
Dec 20 19:51:59 iaw-shuttle pulseaudio[5965]: [pulseaudio] main.c: Please read http://pulseaudio.org/wiki/WhatIsWrongWithSystemMode for an explanation why system mode is usually a bad idea.
Dec 20 19:51:59 iaw-shuttle kernel: [ 745.664603] 4:2:1: cannot get freq at ep 0x1
Dec 20 19:51:59 iaw-shuttle kernel: [ 745.724507] 4:1:1: cannot get freq at ep 0x81
Dec 20 19:52:05 iaw-shuttle pulseaudio[5965]: [pulseaudio] module-always-sink.c: Unable to load module-null-sink
Dec 20 19:52:08 iaw-shuttle pulseaudio[5990]: [pulseaudio] main.c: Running in system mode, forcibly disabling SHM mode!
Dec 20 19:52:08 iaw-shuttle pulseaudio[5990]: [pulseaudio] main.c: Running in system mode, forcibly disabling exit idle time!
Dec 20 19:52:08 iaw-shuttle pulseaudio[5992]: [pulseaudio] main.c: OK, so you are running PA in system mode. Please note that you most likely shouldn't be doing that.
Dec 20 19:52:08 iaw-shuttle pulseaudio[5992]: [pulseaudio] main.c: If you do it nonetheless then it's your own fault if things don't work as expected.
Dec 20 19:52:08 iaw-shuttle pulseaudio[5992]: [pulseaudio] main.c: Please read http://pulseaudio.org/wiki/WhatIsWrongWithSystemMode for an explanation why system mode is usually a bad idea.
Dec 20 19:52:08 iaw-shuttle kernel: [ 754.604317] 4:2:1: cannot get freq at ep 0x1
Dec 20 19:52:08 iaw-shuttle kernel: [ 754.646616] 4:2:1: cannot get freq at ep 0x1
Dec 20 19:52:08 iaw-shuttle kernel: [ 754.674602] 4:2:1: cannot get freq at ep 0x1
Dec 20 19:52:13 iaw-shuttle pulseaudio[1987]: [alsa-source] alsa-source.c: Error opening PCM device front:0: Device or resource busy
Dec 20 19:52:22 iaw-shuttle kernel: [ 768.630414] gnome-control-c[6002]: segfault at 7fffabd88e58 ip 00007f5a6f0939f2 sp 00007fffabd88d20 error 6 in libc-2.15.so[7f5a6f04b000+1b5000]
Dec 20 19:52:50 iaw-shuttle kernel: [ 796.482841] gnome-control-c[6013]: segfault at 7fff8a744d68 ip 00007f8170cdc9f2 sp 00007fff8a744c30 error 6 in libc-2.15.so[7f8170c94000+1b5000]
Dec 20 19:54:01 iaw-shuttle kernel: [ 867.223027] gnome-control-c[6031]: segfault at 7fffe1112ec8 ip 00007fa72cdba9f2 sp 00007fffe1112d90 error 6 in libc-2.15.so[7fa72cd72000+1b5000]