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Actually, it's due to my lack of karma on this particular stackexchange, so I'm disallowed "by design" from answering questions, which IMO is pretty dumb and counterproductive. I have a high karma on stackoverflow. Never mind, it's all sorted out now (albeit you got the karma for my answer, so the problem of me not being able to answer questions remains).
Ale: yes, it is the same question (as I mentioned in my comment there), but that question is locked and all the answers are wrong, so the only option I had was to post a duplicate question with the correct answer here. I would suggest unlocking that question so I can post my answer there, as having this duplicates seems silly and wasteful.
It looks like google has changed how this is done. It isn't allowing me to post my answer here (as I don't have a high enough reputation on this stackexchange site), but I've posted it here: webapps.stackexchange.com/questions/102407/…