What this looks like, is what those pages would like like in plain HTML without any CSS, which suggests that your browser is showing you these pages without rendering the CSS at all. Since it's affecting a lot of different pages, what I suspect happened is that you've cached some weirdly broken CSS file from one page, that was named "style.css" - which is the name that lots and lots of sites use for their main stylesheet - and that's preventing you from loading the style.css from any other site somehow? Hard to figure out how that might affect multiple browsers, though. But yeah, clearing your cache ought to help if it's something like what I'm guessing, and if this were happening on my computer, I think I'd be pursuing my semi-implausible theory and trying to figure out what's going on :)