Output from gnome-screensaver --no-daemon --debug while trying to get the screen to unlock:

[find_window_at_pointer] gs-manager.c:1175 (01:53:03):	 Requesting unlock for screen 0
[gs_window_request_unlock] gs-window-x11.c:1586 (01:53:03):	 Requesting unlock
[window_dialog_up_cb] gs-manager.c:1084 (01:53:03):	 Handling dialog up
[gs_grab_get_keyboard] gs-grab-x11.c:166 (01:53:03):	 Grabbing keyboard widget=3C00021
[gs_grab_get_mouse] gs-grab-x11.c:193 (01:53:03):	 Grabbing mouse widget=3C00021
[gs_grab_release_mouse] gs-grab-x11.c:237 (01:53:03):	 Ungrabbing pointer
[window_dialog_up_cb] gs-manager.c:1107 (01:53:03):	 Suspending jobs
[gs_job_suspend] gs-job.c:508 (01:53:03):	 suspending job
[gs_job_suspend] gs-job.c:508 (01:53:03):	 suspending job
[popup_dialog_idle] gs-window-x11.c:1531 (01:53:03):	 Popping up dialog
[gs_window_clear_to_background_pixmap] gs-window-x11.c:301 (01:53:03):	 Clearing window to background pixmap
[gs_window_move_resize_window] gs-window-x11.c:455 (01:53:03):	 Move and/or resize window on monitor 0: x=0 y=0 w=1680 h=1050
[error_watch] gs-window-x11.c:959 (01:53:03):	 command error output: [gs_debug_init] gs-debug.c:106 (01:53:03):	 Debugging enabled

[listener_service_deleted] gs-listener-dbus.c:1043 (01:53:03):	 DBUS service deleted: 
[error_watch] gs-window-x11.c:959 (01:53:04):	 command error output: [auth_message_handler] gnome-screensaver-dialog.c:221 (01:53:04):	 Got message style 1: 'Password: '

[listener_service_deleted] gs-listener-dbus.c:1043 (01:53:04):	 DBUS service deleted: 
[gs_window_raise] gs-window-x11.c:728 (01:53:04):	 Raising screensaver window
[gs_window_raise] gs-window-x11.c:728 (01:53:04):	 Raising screensaver window
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[window_obscured_cb] gs-manager.c:1360 (01:53:04):	 Handling window obscured: obscured
[gs_job_stop] gs-job.c:479 (01:53:04):	 stopping job
[gs_job_stop] gs-job.c:482 (01:53:04):	 Could not stop job: pid not defined
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[window_obscured_cb] gs-manager.c:1360 (01:53:04):	 Handling window obscured: unobscured
[manager_maybe_start_job_for_window] gs-manager.c:227 (01:53:04):	 Not starting job because dialog is up
[gs_manager_request_unlock] gs-manager.c:1791 (01:53:04):	 Request unlock but dialog is already up
[lock_command_watch] gs-window-x11.c:1431 (01:53:04):	 command output: WINDOW ID=69206045

[gs_window_xevent] gs-window-x11.c:780 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:780 (01:53:04):	 not raising our windows
[gs_window_move_resize_window] gs-window-x11.c:455 (01:53:04):	 Move and/or resize window on monitor 0: x=0 y=0 w=1680 h=1050
[gs_window_raise] gs-window-x11.c:728 (01:53:04):	 Raising screensaver window
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:780 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:780 (01:53:04):	 not raising our windows
[error_watch] gs-window-x11.c:959 (01:53:04):	 command error output: [gs_lock_plug_enable_prompt] gs-lock-plug.c:1189 (01:53:04):	 Setting prompt to: Password:

[gs_window_xevent] gs-window-x11.c:780 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:780 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[gs_window_xevent] gs-window-x11.c:799 (01:53:04):	 not raising our windows
[window_obscured_cb] gs-manager.c:1360 (01:53:04):	 Handling window obscured: obscured
[gs_job_stop] gs-job.c:479 (01:53:04):	 stopping job
[gs_job_stop] gs-job.c:482 (01:53:04):	 Could not stop job: pid not defined
[error_watch] gs-window-x11.c:959 (01:53:07):	 command error output: [request_response] gnome-screensaver-dialog.c:149 (01:53:07):	 got response: -2