When running Xorg configured to use two separate X screens xfce4-settings-helper segfaults.

Here's the output of "gdb xfce4-settings-helper"

$ gdb ./xfce4-settings-heer 
GNU gdb 6.8
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 "i686-pc-linux-gnu"...
(gdb) run -d
Starting program: /home/sascha/xfce4-settings-4.5.93/xfce4-settings-helper/xfce4-settings-helper -d
[Thread debugging using libthread_db enabled]
[New Thread 0xb73b6910 (LWP 32297)]
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = <Super>h
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = <Super>s
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = <Control><Alt>Delete
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = XF86AudioMute
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = XF86AudioLowerVolume
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = <Alt>F2
DBG[keyboard-shortcuts.c:252] _xfce_keyboard_shortcuts_helper_load_shortcut(): shortcut = XF86AudioRaiseVolume

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb73b6910 (LWP 32297)]
0xb77b257b in strlen () from /lib/libc.so.6
(gdb) bt
#0  0xb77b257b in strlen () from /lib/libc.so.6
#1  0x0804e7d8 in xfce_workspaces_helper_set_names_prop (
    helper=<value optimized out>, screen=0x9afa2d8, names=0x9b112c8)
    at workspaces.c:162
#2  0x0804ebbf in xfce_workspaces_helper_init (helper=0x9ae1350)
    at workspaces.c:121
#3  0xb796b5d0 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0
#4  0x00000001 in ?? ()
#5  0x00000000 in ?? ()










And in the attachement is a core dump.