Created attachment 316400 [details]
Xorg.0.log

Description of problem:
I'm not sure what's triggering this but once seeing this issue, metacity is crashing immediately when run it manually.

Version-Release number of selected component (if applicable):
metacity-2.22.0-3.fc9.x86_64

% DISPLAY=:0 gdb --args metacity --replace
GNU gdb Fedora (6.8-21.fc9)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu"...
(gdb) r
Starting program: /usr/bin/metacity --replace
[Thread debugging using libthread_db enabled]
[New Thread 0x7f14de3c37d0 (LWP 28046)]

Program received signal SIGSEGV, Segmentation fault.
0x000000000041c730 in event_callback (event=0x7fffe63f6370, data=0x11fdb50) at core/display.c:1988
1988              meta_workspace_focus_default_window (new_screen->active_workspace, 
(gdb) p new_screen
$1 = (MetaScreen *) 0x0
(gdb) thread apply all bt

Thread 1 (Thread 0x7f14de3c37d0 (LWP 28046)):
#0  0x000000000041c730 in event_callback (event=0x7fffe63f6370, data=0x11fdb50) at core/display.c:1988
#1  0x0000000000463106 in filter_func (xevent=0x12057a0, event=<value optimized out>, data=0x31125d79) at ui/ui.c:83
#2  0x0000003bdf65418b in gdk_event_apply_filters (xevent=Could not find the frame base for "gdk_event_apply_filters".
) at gdkevents-x11.c:345
#3  0x0000003bdf654f0f in gdk_event_translate (display=Could not find the frame base for "gdk_event_translate".
) at gdkevents-x11.c:896
#4  0x0000003bdf657a16 in _gdk_events_queue (display=Could not find the frame base for "_gdk_events_queue".
) at gdkevents-x11.c:2285
#5  0x0000003bdf657bec in gdk_event_dispatch (source=Could not find the frame base for "gdk_event_dispatch".
) at gdkevents-x11.c:2345
#6  0x0000003bdde374db in IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2012
#7  0x0000003bdde3acbd in g_main_context_iterate (context=<value optimized out>, block=<value optimized out>, dispatch=<value optimized out>, 
    self=<value optimized out>) at gmain.c:2645
#8  0x0000003bdde3b1ed in IA__g_main_loop_run (loop=<value optimized out>) at gmain.c:2853
#9  0x000000000042a9d3 in main (argc=1, argv=0x7fffe63f6b88) at core/main.c:476
(gdb) l 1980
1975              break;
1976            }
1977  
1978          /* If the mouse switches screens, active the default window on the new
1979           * screen; this will make keybindings and workspace-launched items
1980           * actually appear on the right screen.
1981           */
1982          if (display->active_screen !=
1983              meta_display_screen_for_root (display, event->xcrossing.root))
1984            {
(gdb) 
1985              MetaScreen *new_screen;
1986              new_screen = meta_display_screen_for_root (display,
1987                                                         event->xcrossing.root);
1988              meta_workspace_focus_default_window (new_screen->active_workspace,
1989                                                   NULL,
1990                                                   event->xcrossing.time);
1991            }
1992  
1993          /* Check if we've entered a window; do this even if window->has_focus to
1994           * avoid races.
(gdb) p display
$2 = <value optimized out>
(gdb) p event->xcrossing
$3 = {type = 7, serial = 2272, send_event = 0, display = 0x11be410, window = 1109393445, root = 279, subwindow = 1109393504, time = 823287161, x = 1961, y = 1347,
  x_root = 761, y_root = 1347, mode = 0, detail = 4, same_screen = 1, focus = 1, state = 16}