 <p>Try upgrading to the latest version of <a href="https://github.com/fnagel/jquery-ui/wiki/Selectmenu" rel="nofollow">Selectmenu</a>. This resolved the issue for me when I upgraded our site to the latest jQuery release (1.8.3). Seems like some old code in the selectmenu API that just never worked, and when upgrading jQuery, it starts throwing errors.</p>