Comment 4 for bug 1005629

The problem started to happen when final version of ubuntu 12.04 was released. Through alpha-beta2 I didn't experience everything was ok. I didn't upgrade to the final release, I just reinstalled on a new partition.

Since I experience this problem on Cinnamon, Unity 3D, gnome classic session (excluding the no effects version), and gnome 3, the problem lies in something else in Ubuntu 12.04. Maybe its xorg, compiz, or something that isn't working well with Nvidia drivers. I had version current and I'm using verison current updates.

Results from running unity --reset
When Unity 3D tries to load and manages not to have a segmentaion fault, it shows this at the end:

"WARN unity.screeneffectframebufferobject ScreenEffectFramebufferObject.ccp:170 unsupported format
WARN unity.gdk <unknown>:0 compiz: Fatal IO error 11 (Resource Temporiraly unavailable) on X server 0.

gtk-window-decorator: Fatal IO error 11 (Resource Temporiraly unavailable) on X server 0.0."

I got this from running the command in terminal on Unity 2D:
WARNING: Unity currently default profile, so switching to metacity while resetting the values
unity-panel-service: no process found
Checking if settings need to be migrated ...no
Checking if internal files need to be migrated ...no
Backend : gconf
Integration : true
Profile : unity
Adding plugins
Initializing core options...done
compiz (core) - Warn: failed to receive ConfigureNotify event on 0x2000004

compiz (core) - Warn: failed to receive ConfigureNotify event on 0x1400002

compiz (core) - Warn: failed to receive ConfigureNotify event on 0x1200002

Initializing composite options...done
Initializing opengl options...done
Initializing decor options...done
Initializing vpswitch options...done
Initializing snap options...done
Initializing mousepoll options...done
Initializing resize options...done
Initializing place options...done
Initializing move options...done
Initializing wall options...done
Initializing grid options...done
Initializing session options...done
Initializing gnomecompat options...done
Initializing animation options...done
Initializing fade options...done
Initializing unitymtgrabhandles options...done
Initializing workarounds options...done
Initializing scale options...done
compiz (expo) - Warn: failed to bind image to texture
Initializing expo options...done
Initializing ezoom options...done

(compiz:8145): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed
Initializing unityshell options...done
compiz (core) - Warn: unhandled ConfigureNotify on 0x3a00090!
compiz (core) - Warn: this should never happen. you should probably file a bug about this.
compiz (core) - Warn: unhandled ConfigureNotify on 0x3a00093!
compiz (core) - Warn: this should never happen. you should probably file a bug about this.
compiz (core) - Warn: unhandled ConfigureNotify on 0x3a00096!
compiz (core) - Warn: this should never happen. you should probably file a bug about this.
WARN 2012-05-28 14:36:49 unity.libindicator <unknown>:0 Desktop file '/usr/share/applications/google-chrome.desktop' is using a deprecated format for its actions that will be dropped soon.
Initializing annotate options...done
Initializing blur options...done
Initializing clone options...done
Initializing colorfilter options...done
Initializing commands options...done
Initializing cube options...done
Initializing imgjpeg options...done
Initializing kdecompat options...done
Initializing mag options...done
Initializing neg options...done
Initializing obs options...done
Initializing opacify options...done
Initializing put options...done
Initializing resizeinfo options...done
Initializing ring options...done
Initializing rotate options...done
Initializing scaleaddon options...done
Initializing screenshot options...done
Initializing shift options...done
Initializing staticswitcher options...done
Initializing switcher options...done
Initializing thumbnail options...done
Initializing water options...done
Initializing winrules options...done
Initializing wobbly options...done
ERROR 2012-05-28 14:36:52 unity.glib-gobject <unknown>:0 g_object_unref: assertion `G_IS_OBJECT (object)' failed
Setting Update "main_menu_key"
Setting Update "run_key"
Starting gtk-window-decorator
Segmentation fault (core dumped)