Description of problem:
fresh boot of FC18 beta followed by a login to MATE.

Version-Release number of selected component:
mate-settings-daemon-1.5.3-5.fc18

Additional info:
backtrace_rating: 4
cmdline:        /usr/libexec/mate-settings-daemon
crash_function: __strlen_sse2_pminub
executable:     /usr/libexec/mate-settings-daemon
kernel:         3.6.7-5.fc18.x86_64
uid:            500
xsession_errors: 

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 __strlen_sse2_pminub at ../sysdeps/x86_64/multiarch/strlen-sse2-pminub.S:38
 #1 g_strdup at gstrfuncs.c:363
 #2 value_collect_string at gvaluetypes.c:293
 #3 gtk_list_store_set_valist_internal at gtkliststore.c:802
 #4 gtk_list_store_set_valist at gtkliststore.c:899
 #5 gtk_list_store_set at gtkliststore.c:941
 #6 msd_modmap_dialog_call at msd-xmodmap.c:386
 #7 msd_keyboard_xkb_chk_lcl_xmm at msd-keyboard-xkb.c:581
 #8 msd_keyboard_xkb_init at msd-keyboard-xkb.c:700
 #9 start_keyboard_idle_cb at msd-keyboard-manager.c:337