title: jQuery UI Datepicker - Uncaught TypeError: Cannot read property 'msie' of undefined
body: <p>I've developed a website in WordPress and installed the Gravity Forms plugin (<a href="http://www.gravityforms.com/" rel="noreferrer">http://www.gravityforms.com/</a>). I have added a book online form to a page, but the datepicker is returning the following error in the console when clicked:</p>
  
  <p>Uncaught TypeError: Cannot read property 'msie' of undefined</p>
  
  <p><a href="http://ultimatepaintball.com.au/packages/book-online/" rel="noreferrer">http://ultimatepaintball.com.au/packages/book-online/</a></p>
  
  <p>Has anyone experienced this issue before? I read somewhere that it may be an issue with jQuery 1.9 and $.browser, but the issue persists even when I fall back to 1.8.3.</p>
  
  <p>Thanks.</p>