I upgrade this version for repalce deprecated functions register_sidebar_widget() and register_widget_control() with wp_register_sidebar_widget() and wp_register_widget_control(), I have tested it and it works well. Because I found another feature request and I am coding for it, I will publish the new version to.org once another feature be realized too, so users will not need upgrade always in a short time.
Please download this version at here — wordpress-tooltips-3-7-1
Thanks, have a good day. 🙂