I have a Thirty Ten theme (child theme of Twenty Ten), and though my sub items on my navigation bar show up, they are only clickable upon the first time you hover over one. So, if you hover over one, but do not click any of them, none of them are clickable. If you click one, and then go to that page, again, once you hover one of them, none can be clicked. Crazy!
Any help would be appreciated. I have just about exhausted what I have found via my Google searches, and am under deadline for a Nov. 1 PR campaign.