This is probably some css z-index thing, but I'm not quite sure yet, i'm looking further into it.
The ad needs pushing further down the page. Overlaying that user menu on top of the ad is just calling for an invalid click activity strike.
might/should fix this, at least for anons. Tested on Opera 37.0.2178.32 under Windows 7. No idea what to do w/ logged-in users, though.