I have the same problem as described from other users: solution is to toggle the Terminal (Ctrl + Alt + F1) and then toggle bock to Gnome (Gtrl + Alt + F7)
/var/log/messeges Mar 23 10:16:30 HOST gnome-shell[2076]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed Mar 23 10:16:30 HOST gnome-shell[2076]: g_object_set: assertion 'G_IS_OBJECT (object)' failed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1181666 Title: gnome-shell randomly blocks mouse clicks from working in app windows To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1181666/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs