title: jQuery tooltip flickers on links when position is specified
body: <p>When I add a tooltip to a normal link, and specify the position (any position), the tooltip will only show if the mouse is hovered exactly over the text. If I don't specify a position, it works all hunky dory.</p>
  
  <p>This is incredibly disheartening, considering this is basic functionality.</p>
  
  <p>I've replicated this in jsfiddle: <a href="http://jsfiddle.net/6EZHZ/65/" rel="nofollow">http://jsfiddle.net/6EZHZ/65/</a></p>
  
  <p>It's also worth mentioning that the given example in documentation works:</p>
  
  <pre><code>$( ".selector" ).tooltip({ 
      position: { my: "left+15 center", at: "right center" } 
  });
  </code></pre>
  
  <p>Why is this happening? Is there a good solution that's not an ugly hack?</p>