Starting of xfce4-mixer fails with segmentation fault.
Output of gdb is:
Starting program: /usr/bin/xfce4-mixer 
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/libgobject-2.0.so.0.3400.1-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffeaa91700 (LWP 2991)]
[New Thread 0x7fffea290700 (LWP 2992)]
[New Thread 0x7fffe9885700 (LWP 2993)]
Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff743a3b5 in ?? () from /usr/lib/libgtk-x11-2.0.so.0


Backtrace command of gdb prints this here:

(gdb) backtrace
#0  0x00007ffff743a3b5 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#1  0x00007ffff6eec637 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#2  0x00007ffff5fb1865 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff5fb1b98 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007ffff5fb1f92 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#5  0x00007ffff74c1457 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#6  0x0000000000406670 in ?? ()
#7  0x00007ffff5284725 in __libc_start_main () from /usr/lib/libc.so.6
#8  0x00000000004066b5 in ?? ()



Occurrs since a system update before a couple of weeks. It might be that the update from xfce4-mixer 4.8.0 to 4.10.0 is the reason.
 
xfce4-mixer version : 4.10.0
OS: Archlinux 64bit
GTK2: 2.24.13
I've already removed the config files in ~/.conf/xfce4/xfconf/xfce-perchannel-xml, but this didn't make any change.