I have asked this question here at stackoverflow:   http://stackoverflow.com/questions/16889617/jquery-ui-tooltip-effects-are-buggy?noredirect=1#comment24369785_16889617

Basically, the problem is that I am using effect for a jQuery UI Tooltip, but the tooltips sometimes do not go away and linger on the page.  Is there a way to force all tooltips to be hidden before showing another tooltip?