This is the weirdest problem I ever had.

Since this week, I can open Chrome and Opera, but I can't click anything in the browser. Links light up and menus too, but if I click them, nothing happens. Firefox works perfectly.

I use a standard Ubuntu install and the left menu works and that is where I can open and close those browsers, but within the browsers I can't do anything.

What could be wrong? I have googled the problem and checked this forum, but it seems I am the only one?