Maybe I'm just going mad, but with a bounty in place, the recent-elongated "action list" on a question seems to be screwing up the layout of SO questions.
I've not seen this before.
Firefox 4.0.1 here.
Closing this, as it is not a site issue, but a custom user script causing it. You're welcome to use scripts, of course....but if it breaks, it breaks - not a bug in the site itself.