It's gone whappy.
Takes at least two clicks of the back button to navigate away from a page or thread. Doesn't matter what device, etc. I'm using.
I'm wondering if it's something to do with the irritatingly flashy adverts? As a heads up, the more something flashes at me or forces me to do something then the less I'm likely to be interested, in fact I'm very much more likely to not be interested in it.