They've completely changed the in-game browser. Before it used to be based off Firefox 1.x, the patch changed it to the awesomium framework (they use the same framework for the Launchpad) so it's completely different and will hopefully work like a normal browser now (thank god, sick of trying to work around the issues the old one caused with website likes EQ2i).
A quick test shows that any old browser windows likely need to be updated (or temporarily reverted to default) to work for now.
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