Hi. Recently I've started having the problem reported by others months ago of being faced with no less than 10 ridiculous puzzles to complete in order to log on. Having done so it says you have failed verification. Having been through changing lots of things I'm convinced it's not to do with browser, extensions, VPN or whatever as it is only intermitant and other times I simply get a code to email and log in no problem. So are these puzzles the fault of Dropbox ? Why on earth is this happening ? Very frustrating.