I have just tried to reproduce this with my pcmcia layla, alas no luck !
Noahy could you do the same with this libsound.so and attach again the trace 
from running the control centre from terminal. 
Sorry about this but you are my only means for debugging this . I have a 
feeling it must be something to do with USB sound cards. 

That produced output should confirm that the usb card is returning is no
ports when in fact 'pactl list cards' shows that there are ports.

The problem I can see is that my software recognizes the device as a bluetooth 
device which is a special case whereby the card is valid while the device has 
no port name. 
 

** Attachment added: "libsoundnua.so"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/953950/+attachment/2949385/+files/libsoundnua.so

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https://bugs.launchpad.net/bugs/953950

Title:
  [soundnua]: gnome-control-center crashed with SIGSEGV in
  signal_emit_unlocked_R()

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