I just tested FireFox, IE, and Chrome, in both dark styles and cannot reproduce it here.
I would make sure you have the latest version of the browsers that you use. If you do, clear your cookies, cache/temp internet files, etc.
My Chrome is v. 17.0.963.56
My FireFox is v. 10.0.2
My IE is v. 9.0.8112.16421