Twenty ten custom menu sub item issue

If anyone has a suggestion that I’m missing I would appreciate it.

This site, New Hope Literacy Task Force, is using a child theme of Twenty Ten. While I centered the nav menu I did not create a custom menu – the default was fine. Until the upgrade to WP Photo Album Plus where I found the newly created “widget landing page” appearing as a part of the menu. Since there is no option to remove that but to create the custom menu I did – and found that somewhere I’ve got an error that I can not find, even with staring at Firebug data for several hours. The sub menu under the “about” parent menu is always displayed instead of only appearing when the parent is hovered. It was exactly correct in the default but now the child menu items are always visible.

Anyone see where I’ve made an error on the stylesheet?

Thanks.