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I'm working with a new install of 13.04 64bit desktop. Every time I lock my screen the laptop will lock up hard enough that I cannot switch terminals. Ctrl+Alt+Bkspc and Ctrl+Alt+Del also do not work. I have to hard cycle the system to get back in.

Through another post i was pointed to /var/crash. I found a file _usr_bin_compiz.1000.crash

and here is a grep with CRITICAL

ahachenberg@ahachenberg-Latitude-E6520:/var/crash$ grep CRITICAL _usr_bin_compiz.1000.crash 
 [+1.11s] CRITICAL: dbusmenu_client_get_root: assertion `DBUSMENU_IS_CLIENT(client)' failed
 [+1.11s] CRITICAL: dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
 [+3.72s] CRITICAL: ido_calendar_menu_item_get_calendar: assertion `IDO_IS_CALENDAR_MENU_ITEM (menuitem)' failed
 [+3.72s] CRITICAL: gtk_calendar_get_date: assertion `GTK_IS_CALENDAR (calendar)' failed
 [+3.72s] CRITICAL: gtk_calendar_select_month: assertion `GTK_IS_CALENDAR (calendar)' failed
 [+3.72s] CRITICAL: gtk_calendar_select_day: assertion `GTK_IS_CALENDAR (calendar)' failed
 [+10.40s] CRITICAL: dbusmenu_client_get_root: assertion `DBUSMENU_IS_CLIENT(client)' failed
 [+10.40s] CRITICAL: dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
 (nautilus:2035): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed
 (nautilus:2035): GLib-GObject-CRITICAL **: g_object_set: assertion `G_IS_OBJECT (object)' failed
 gnome-session[1902]: CRITICAL: We failed, but the fail whale is dead. Sorry....
ahachenberg@ahachenberg-Latitude-E6520:/var/crash$
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