I have just noticed that Dropdown menu items are being highlighted when doing a Relevannsi search. I am using latest version (2.9.12), WP 3.3.
Demo site http://wpias.imageandstory.com/
(using TwentyTen theme 'out of the box' to show the problem)
If you search for Folio, Tst, FaQ, or Contact, the menu term is also highlighted. (term About does not get highlighted) I saw in the Relevannsi development notes that this was addressed a long way back, and I can't say that I've noticed it until lately. Just passing this along FYI. Thanks.