canberra-gtk-play crashed with SIGSEGV in malloc()

[ubername]

Trying to fix / diagnose a problem I have whereby the sound in my headphones fades once they are plugged in. If I remove them after that my speakers no longer play sounds.

I have been changing some settings in my alsa-base. see here for details: http://ubuntuforums.org/showthread.php?t=913328&page=3

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/bin/canberra-gtk-play
NonfreeKernelModules: nvidia
Package: libcanberra-gnome 0.6-0ubuntu3
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/canberra-gtk-play --id=desktop-login --description=GNOME\ Login
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: libcanberra
StacktraceTop:
 ?? () from /lib/libc.so.6
 malloc () from /lib/libc.so.6
 pa_xrealloc () from /usr/lib/libpulse.so.0
 ?? () from /usr/lib/libpulse.so.0
 ?? () from /usr/lib/libpulse.so.0
Title: canberra-gtk-play crashed with SIGSEGV in malloc()
Uname: Linux 2.6.27-7-generic x86_64
UserGroups: adm admin cdrom dialout fuse lpadmin plugdev sambashare