Hi. I searched for this problem but couldn't find it. I'm trying out the Twenty Ten them in WordPress 3.0. It works fine in IE, Chrome and Safari for Windows, but I have a problem with Firefox 3.6.6. The dropdowns appear, but when you try to put your mouse over the submenus, they disappear. Also, when the dropdowns appear, there is a space of 5 pixels or so between the nav bar and the dropdowns. It works fine in the theme preview. Any ideas?