Hello, same issue here. I have this bug, it happens randomly without manipulation. Here the log:
(mate-volume-control-status-icon:362306): Gtk-WARNING **: 08:21:55.878: gtk_widget_size_allocate(): attempt to allocate widget with width -7 and height 1 (mate-volume-control-status-icon:362306): Gtk-WARNING **: 12:58:14.570: Calling gtk_widget_realize() on a widget that isn't inside a toplevel window is not going to work very well. Widgets must be inside a toplevel container before realizing them. (mate-volume-control-status-icon:362306): GLib-GObject-CRITICAL **: 12:58:14.570: g_object_ref: assertion 'G_IS_OBJECT (object)' failed (mate-volume-control-status-icon:362306): Gdk-CRITICAL **: 12:58:14.570: gdk_window_get_scale_factor: assertion 'GDK_IS_WINDOW (window)' failed ** Gtk:ERROR:../../../../gtk/gtkwidget.c:5871:gtk_widget_get_frame_clock: assertion failed: (window != NULL) Bail out! Gtk:ERROR:../../../../gtk/gtkwidget.c:5871:gtk_widget_get_frame_clock: assertion failed: (window != NULL) Abandon Thanks.
