In this website ([login to view URL]) there is a drop down menu bug (we are using suckerfish on a Joomla/Community Builder site).
If you click the "Login/Register" link page you will notice that the "What is it?" submenu links are not working correctly (you cannot select them).
It works for all other pages/links.
It works fine with other Community Builder modules too.
If you use firebug you will notice that the nav bar CSS changes for some reason. I have no idea why this is happening.