When Cinnamon starts, it shows a black background. The desktop icons still work, but when opening any window, it spawns in the upper left corner, doesn’t have a border, and isn’t draggable.
.xsession-errors shows the following:
[3557:0928/100501.592766:ERROR:electron/shell/browser/notifications/linux/libnotify_notification.cc:50] notify_notification_show: domain=331 code=2 message="GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name is not activatable"
(xapp-sn-watcher:3535): GLib-GObject-CRITICAL **: 10:05:10.475: g_object_set: assertion 'G_IS_OBJECT (object)' failed
(xapp-sn-watcher:3535): GLib-GIO-CRITICAL **: 10:05:10.475: g_dbus_interface_skeleton_flush: assertion 'G_IS_DBUS_INTERFACE_SKELETON (interface_)' failed
(xapp-sn-watcher:3535): GLib-GObject-CRITICAL **: 10:05:10.475: g_object_set: assertion 'G_IS_OBJECT (object)' failed
(xapp-sn-watcher:3535): GLib-GIO-CRITICAL **: 10:05:10.475: g_dbus_interface_skeleton_flush: assertion 'G_IS_DBUS_INTERFACE_SKELETON (interface_)' failed
(xapp-sn-watcher:3535): GLib-GObject-CRITICAL **: 10:05:10.475: invalid (NULL) pointer instance
(xapp-sn-watcher:3535): GLib-GObject-CRITICAL **: 10:05:10.475: signal_emit_valist_unlocked: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(csd-power:3387): GLib-GObject-CRITICAL **: 10:06:55.847: invalid (NULL) pointer instance
(csd-power:3387): GLib-GObject-CRITICAL **: 10:06:55.847: g_signal_handlers_disconnect_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(csd-print-notifications:3395): GLib-CRITICAL **: 10:06:55.847: Source ID 4 was not found when attempting to remove it
(csd-power:3387): GLib-GObject-CRITICAL **: 10:06:55.847: invalid (NULL) pointer instance
(csd-power:3387): GLib-GObject-CRITICAL **: 10:06:55.847: g_signal_handlers_disconnect_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Rolling back from 20250925-0 to 20250923-0 fixes the issue.