The dropdown boxes for the “Community” link, Search link, “Quick Links”, and all the thread tools/search this thread/rate this thread/display modes links have been broken since the site and forums were redesigned.
In Firefox 3.6, Chrome 4.1 and IE 8, the boxes all appear some distance away from the link they’re supposed to appear underneath.
If a box appears outside the main white page background, they are considered overflow by the browser, and don’t show - this makes most of the dropdown boxes un-usable 
You can see what I mean in this screenshot.
I’ll have a look into that. Yeesh.