Recently (although can't say exactly when, within the last month or so) the drop down menus stopped working in Internet Explorer (testing on IE 11).  Works fine in Chrome however.  We were on 1.3 but just purchased 2.1 and applied to the site today in hopes it would fix the issue.  Please let me know what I can do to get this functionality restored.

I should note the same behavior in Microsoft Edge...

Upgraded to 4.5 today and the issue appears to be resolved.