The first time a user hovers over a menu item all of its sub-sub menus are opening. This doesn't happen in the example on the superfish site.
If you then hover over one of the sub menu items the sub-subs close and behave as expected.
Here's a fiddle: http://jsfiddle.net/gPkDY/2/
The problem occurs with or without the CSS but it's easier to see with the CSS. It's also definitely a problem with superfish since with javascript disabled the CSS fallback works properly.
Client is using jQuery 1.7.1 and the most recent version of superfish.
Thanks!