Dropdown menu stopped working

There were several Javascript changes in the 3.1.2 release to prevent some common conflicts with other extensions. Without it being installed, it'd be difficult to diagnose. If you want to upgrade again, here are the things to test/check:
* In the Advanced Parameters area, set "Include jQuery" to yes. This is a compatibility mode version of jQuery and Bootstrap which should work in all cases. Test with this on first, then disable if you think your site is already properly including these files.
* Clear your browser and Joomla caches

Test again. If that still doesn't work, let us know where we can see the page and we'll gladly investigate further.

Thanks,
Alex

I just logged into your site and the drop-down is working just fine when I click the button.

Can you clear your Joomla and browser's cache and try again? If still not, try from a different computer or user and make sure it's not specific to your computer.

Thanks,
Alex