Top WordPress toolbar: Second level dropdowns blank

Hi! I’ve been searching for a solution and haven’t found one yet. I use bbPress and BuddyPress on my site, but am having trouble with the top menus’ text not showing up. My top WordPress toolbar shows the first level when hovering over sections like “Forums” and the “Howdy” my account info, but when I hover over those items, the second level dropdowns are blank. They briefly show up when I guide my cursor to the top of the box. Oddly, they show up fine when I’m in my WordPress Dashboard. Here’s a link to my site: http://kingdompen.org/

However, you won’t be able to see the problem unless you are logged into the site, so here is a link to a screenshot: http://kingdompen.org/wp-content/uploads/2014/01/2nd-level-dropdown-blank.png

Thanks in advance!
Rachel

WordPress version 3.8
BuddyPress version 1.9.1