Unsurprisingly enough, IE doesn't have this problem. Neither does Phoenix, and that actually does surprise me.
I have also just discovered that Opera 7 is choking on a rather important navigation bar within my Credit Union's site. I'm not sure if I should blame this on the credit union for not following standard HTML guidelines (maybe they are, maybe they aren't) or if I should blame this on Opera. I think I'll just declare it a loss on both sides and go back to Phoenix for the time being.