Months, Categories, and Tags Dropdowns Don't Work

I’m using the Standard All-In-One Event Calendar, version 1.10.9.

The problem is that the Months, Categories, and Tags dropdowns do not work on the calendar page.

I’m currently using a child theme of the Twenty Ten theme. Here’s what I’ve tried so far:

• Switched to the Twenty Eleven and Twenty Thirteen default themes to see if I have a theme conflict. The dropdowns still didn’t work.
• Disabled all plugins except for the Calendar to rule out a plugin conflict. The dropdowns still didn’t work.
• I noticed jQuery wasn’t loading on this site, so I loaded jQuery. The dropdowns still didn’t work.
• I did a file comparison of all the AIO files with a site that is working using Meld, and found no differences except in the cache folder.
• Went to Events -> Theme Options and Saved the options to regenerate the CSS. The dropdowns still didn’t work.
• Verified that the AIO CSS file is in fact loading. It is.
• Removed a widget that loads some off-site javascript to make sure it wasn’t interfering. The dropdowns still didn’t work.

I am not getting any javascript errors in Firebug. I checked for the menu CSS and it all looks good. I really suspect it is a javascript problem, because it looks like hovering over the dropdown-toggle class doesn’t trigger the switch of the value for “display” in the class declaration for .timely .dropdown-menu so that the appropriate dropdown menu appears.

If I use Firebug to switch the “display” value from “none,” the menus appear in their proper places.

I should mention that this site was using the Lite version of AIO and I upgraded the plugin when WP 3.7.1 came out, which broke it, but I have followed the manual removal and update to the Standard version according to the instructions on the Timely site, and otherwise the calendar appears to be working fine now.

You can see the problem page here.

http://wordpress.org/plugins/all-in-one-event-calendar/