When you open segments app then it gets several Gtk-CRITICAL messages:
(pyopentracks:21096): Gtk-CRITICAL **: 17:18:18.420: gtk_bin_get_child: assertion 'GTK_IS_BIN (bin)' failed
(pyopentracks:21096): Gtk-CRITICAL **: 17:18:18.420: gtk_menu_item_get_submenu: assertion 'GTK_IS_MENU_ITEM (menu_item)' failed
(pyopentracks:21096): Gtk-CRITICAL **: 17:18:18.420: gtk_widget_set_sensitive: assertion 'GTK_IS_WIDGET (widget)' failed
When you open segments app then it gets several Gtk-CRITICAL messages: