compiz crashed with signal 5 in g_type_create_instance()

[Brad Heap]

Unity isn't starting from command DISPLAY=:0 unity under 14.04

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: unity 7.2.0+14.04.20140403-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-22.44-generic 3.13.8
Uname: Linux 3.13.0-22-generic x86_64
ApportVersion: 2.14-0ubuntu1
Architecture: amd64
CrashCounter: 1
Date: Fri Apr 4 16:40:23 2014
ExecutablePath: /usr/bin/compiz
InstallationDate: Installed on 2013-12-09 (115 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
ProcCmdline: compiz --replace
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=linux
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
Signal: 5
SourcePackage: unity
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libbamf3.so.2
 g_type_create_instance () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_object_newv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_object_new () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: compiz crashed with signal 5 in g_type_create_instance()
UpgradeStatus: Upgraded to trusty on 2014-04-01 (3 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionErrors:
 (process:4626): dconf-CRITICAL **: unable to create file '/home/brad/.cache/dconf/user': Permission denied. dconf will not work properly.
 (process:4626): dconf-CRITICAL **: unable to create file '/home/brad/.cache/dconf/user': Permission denied. dconf will not work properly.

[Apport retracing service (apport)]

StacktraceTop:
 ?? () from /tmp/apport_sandbox_p6Ekgk/usr/lib/x86_64-linux-gnu/libbamf3.so.2
 g_type_create_instance (type=<optimized out>) at /build/buildd/glib2.0-2.40.0/./gobject/gtype.c:1868
 g_object_new_internal (class=class@entry=0x1dc4c30, params=params@entry=0x0, n_params=n_params@entry=0) at /build/buildd/glib2.0-2.40.0/./gobject/gobject.c:1724
 g_object_newv (object_type=object_type@entry=31073968, n_parameters=n_parameters@entry=0, parameters=parameters@entry=0x0) at /build/buildd/glib2.0-2.40.0/./gobject/gobject.c:1868
 g_object_new (object_type=31073968, first_property_name=0x0) at /build/buildd/glib2.0-2.40.0/./gobject/gobject.c:1568