ref_count == 0, but source was still attached to a context

[Angel Guzman Maeso]

Startng a user sesson desktop as "Gnome Sesson Classicc (Without effects)"

I change to compiz and after to metacity. Then a error message is showed from glib:

$ compiz --replace &
[1] 2880
$ compiz (core) - Info: Loading plugin: core
compiz (core) - Info: Starting plugin: core
compiz (core) - Info: Loading plugin: ccp
compiz (core) - Info: Starting plugin: ccp
compizconfig - Info: Backend : ini
compizconfig - Info: Integration : true
compizconfig - Info: Profile : default

$ metacity --replace &
[2] 2883
$ compiz (core) - Info: Stopping plugin: ccp
compiz (core) - Info: Unloading plugin: ccp
compiz (core) - Info: Stopping plugin: core
compiz (core) - Info: Unloading plugin: core

(process:2880): GLib-WARNING **: /build/buildd/glib2.0-2.34.0/./glib/gmain.c:1817: ref_count == 0, but source was still attached to a context!

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: metacity 1:2.34.8-0ubuntu4
ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4
Uname: Linux 3.5.0-16-generic i686
ApportVersion: 2.6.1-0ubuntu1
Architecture: i386
Date: Wed Oct 3 17:31:54 2012
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20091126)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: metacity
UpgradeStatus: Upgraded to quantal on 2012-04-26 (160 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Prem Anand (h.prem.anand)]

hprem@hprem-lnx:~$ compiz --replace --debug
compiz (core) - Info: Loading plugin: core
compiz (core) - Debug: Trying to load core from: /home/hprem/.compiz-1/plugins/l
compiz (core) - Debug: dlopen failed: /home/hprem/.compiz-1/plugins/libcore.so:
compiz (core) - Debug: Trying to load core from: /usr/lib/compiz/libcore.so
compiz (core) - Debug: dlopen failed: /usr/lib/compiz/libcore.so: cannot open sh
compiz (core) - Info: Starting plugin: core
compiz (core) - Debug: Started plugin: core
compiz (core) - Info: Stopping plugin: unityshell

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(compiz:18822): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_...