Never noticed this before the past day or two... But when I mouse over my tab dropdowns that show the child and grandchild pages, I can't actually click on those to get to that part of my site. They just appear under the tabs, then when I "chase" them they vanish! I know from experience elsewhere that 2010's dropdowns shouldn't do that, they normally allow you to shortcut to sub-pages on a site.
Any thoughts on this problem? It isn't a major freakout issue, just annoying. I happen to favor Twenty Ten because of its large customizable header and that gorgeous typography so easy on older eyes...