spass@testing:~$ xfwm4-settings
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.
Aborted (core dumped)
spass@testing:~$ xfwm4-settings
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.
Aborted (core dumped)
spass@testing:~$ xfce4-settings-manager
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.

(xfce4-settings-manager:1762): xfce4-settings-manager-CRITICAL **: 04:50:38.137: pluggable dialog "xfwm4-settings" crashed
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.

(xfce4-settings-manager:1762): xfce4-settings-manager-CRITICAL **: 04:50:42.733: pluggable dialog "xfwm4-settings" crashed
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.

(xfce4-settings-manager:1762): xfce4-settings-manager-CRITICAL **: 04:50:47.269: pluggable dialog "xfwm4-settings" crashed
spass@testing:~$ xfce4-settings-manager

(xfwm4-settings:2066): Gtk-WARNING **: 04:57:25.442: gtk_widget_size_allocate(): attempt to underallocate toplevel GtkWindow 0x55dea99b6a70. Allocation is 24x24, but minimum required size is 24x28.

(xfwm4-settings:2066): Gtk-WARNING **: 04:57:25.443: gtk_widget_size_allocate(): attempt to underallocate GtkWindow's child GtkImage 0x55dea99cb870. Allocation is 24x24, but minimum required size is 22x28.
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.

(xfce4-settings-manager:2062): xfce4-settings-manager-CRITICAL **: 04:57:29.817: pluggable dialog "xfwm4-settings" crashed